(svn r10848) [0.5] -Fix (r10841): 'mixed declaration and code' warning

(svn r10846) [0.5] -Fix r10842: a few strings didn't make it through the automated sync system

(svn r10843) [0.5] -Fix r10842: a few strings didn't make it through the automated sync system (more to come though)

(svn r10842) [0.5] -Backport from trunk (r10479, r10488, r10510, r10532, r10550, r10559, r10583, r10592, r10620, r10626, r10648, r10703, r10737, r10828):
- Language updates (r10479, r10488, r10510, r10532, r10550, r10559, r10583, r10592, r10620, r10626, r10648, r10703, r10737, r10828)

(svn r10841) [0.5] -Backport from trunk (r10835, r10593, r10500, r10497, r10410, r10357, r10199):
- Fix: [Windows] Do not try to minimise or restore the window when closing OpenTTD [FS#998] (r10835)
- Fix: One could not remove locks that were build in a (very) old version of OpenTTD [FS#1038] (r10593)
- Fix: One cannot navigate using arrow keys in the game name text box [FS#1038] (r10500)
- Fix: Ship's maximum speed wrongly shown [FS#1013] (r10497)
- Fix: [OSX] Of the resolution is changed to something that is too high for the monitor, then it is reduced to fit the monitor size, solving several crashes and graphical glitches [FS#458] (r10410)
- Fix: NPF was leaking memory each time it got initialized, except for the first time (r10357)
- Fix: [YAPF] 'target_seen' flag that is set prematurely in some cases (1 tile long cached segment followed by target station) which caused asserts to trigger [FS#884] (r10199)

(svn r10840) [0.5] -Update [Lang]: move croation from unfinished, and prepare it for a trunk-sync

(svn r10739) [0.5] -Fix [FS#1096]: trains going over bridges would get the "going down hill" accelerate bonus, which causes trains to go faster on bridges than they would be going on level land.

(svn r10735) [0.5] -Fix [FS#1062]: trains being split into two pieces when loading an old savegame.

(svn r10650) [0.5] -Fix: Fix chdir problem with open/save dialog on OS/2 (Paul Smedley)

(svn r10468) [0.5] -Prepare 0.5 branch for release of 0.5.3-RC2.

(svn r10467) [0.5] -Backport from trunk (r10406, r10465):
- Fix: Visual glitches when a window is resized in the WE_CREATE callback (r10465)
- Fix: Only industries in the temperate climate should be affected by the "do not increase production" flag [FS#968] (r10406)

(svn r10400) [0.5] -Backport from trunk (r10399):
- Fix: [Windows] _wnd.has_focus was not properly set after using ALT-TAB [FS#962] (r10399)

(svn r10383) [0.5] -Fix (r10373, FS#958): v->z_pos was wrong for trains on bridge

(svn r10375) [0.5] -Prepare 0.5 branch for release of 0.5.3-RC1.

(svn r10374) [0.5] -Backport from trunk (r10333, r10336, r10337, r10345, 10346, 10368):
- Fix: Waypoints could be renamed when you are not the owner (r10368)
- Fix: The 'old' pathfinders (OPF and NPF) for road vehicles could not find a path when in a tunnel [FS#290] (r10345, r10346)
- Fix: Only add the autoreplace menu when autoreplace actually knows about the group [FS#880] (r10337)
- Fix: Signal state sometimes not properly set when the signal "pathfinder" reached the end of a line [FS#910] (r10336)
- Fix: News messages were shown over the endgame/highscore windows [FS#943] (r10333)

(svn r10373) [0.5] -Backport from trunk (r10306, r10311, r10317, r10339, r10344):
- Fix: Acceleration for trains on slopes is not calculated properly [FS#786] (r10317, r10344)
- Fix: Rail could be destroyed when building tunnels (r10306)

(svn r10372) [0.5] -Backport from trunk (r10288, r10290, r10293, r10294, r10295, r10347, r10348):
- Feature: Make the client list window (for network games) stickyable (r10293)
- Fix: Smooth economy did not close primary industries and it allowed increasing of production of industries that should not have rising productions (r10290, r10347, r10348)
- Fix: Flush the output of the dedicated server console (r10295)
- Fix: The "pause" key did not work in the scenario editor (r10294)
- Fix: Age non-front engines too (so when you move engines around in the depot they do not get age 0 when they are much older [FS#202] (r10288)

(svn r10307) [0.5] -Fix: Got 0.5 compiling on OS/2 again

(svn r10285) [0.5] -Backport from trunk (r10284):
- Fix: don't make everyone spectator if 1 joining client failed to create new company (r10284)

(svn r10282) [0.5] -Fix: compilation without networking support.
[0.5] -Fix: crashes with subsidy messages when using Korean as language.

(svn r10281) [0.5] -Backport from trunk (r10186, r10229, r10251):
- Fix: [Windows] Do not mess desktop when using ALT-TAB [FS#876] (r10251, r10186)
- Cleanup: removed duplicate include (r10229)

(svn r10280) [0.5] -Backport from trunk (r10109, r10219, r10222, r10230, r10246, r10258):
- Fix: Do not look in every direction for tunnels when building one, one direction is enough (r10258)
- Fix: Take the age of the front vehicle for station rating (r10246)
- Fix: Terraforming wipes out canals. Now you always have to remove the canal before terraforming, instead of "just" removing the canal [FS#594] (r10240)
- Fix: Only 2 trains could crash at one time as collision checking stopped on the first hit. This could technically cause desyncs in network games as the collision hash order is not guaranteed [FS#892] (r10222)
- Fix: Land under foundations was terraform when it shouldn't be terraformed [FS#882, FS#890] (r10219)
- Fix: Some NewGRFs use the same (unused in the "current" climate) sprite IDs. Normally this gives some artefacts, but when one NewGRF expects it to be a sprite and another NewGRF overwrites it with a non-sprite nasty things happen (drawing a non-sprite crashes OTTD) [FS#838] (r10109)

(svn r10279) [0.5] -Backport from trunk (r10139, r10153, r10154, r10155, r10165, r10187):
- Fix: Do not make a 270 degree turn on the international airport when a 90 degree turn is enough (r10187)
- Fix: Crash when trying to get the aircraft movement state of an aircraft going to a just deleted airport [FS#874] (r10165)
- Fix: Airports did not flood when there are aircraft on the airport [FS#601] (r10155)
- Fix: Some vehicles were not drawn when having a high resolution and a high zoom-out level [FS#870] (r10154)
- Fix: Vehicles disappear when crossing certain tiles [FS#869] (r10153)
- Fix: OpenTTD assumes that the resolution is at least 1 by 1, so force the resolution to be always at least 1 by 1 (r10139)

(svn r10277) [0.5] -Backport from trunk (10116, r10128, r10130, r10131, r10137, r10138):
- Feature: console command to get the current game date (r10137)
- Fix: When you got a sufficiently small resolution, there is a possibility for a division by zero when a sound is played (r10138)
- Fix: When removing a dock, a ship will always try to reach the old location of the dock even when it cannot anymore because it the old location of the dock is now land instead of water [FS#810] (r10131)
- Fix: SetCurrentGrfLangID returned the wrong language ids for most languages (r10130)

(svn r10275) [0.5] -Backport from trunk (r10048, r10068, r10075, r10082, r10085, r10087):
- Fix: "Deactivate Electrified Railways" did not work [FS#836] (10083)
- Fix: Memory leaks in the networking code [FS#846, FS#844] (r10082, r10075)
- Fix: Coverage area highlight was still show when it was turned off for docks [FS#835] (r10068)
- Fix: Do not use override engine type for articulated wagon parts (r10048)

(svn r10274) [0.5] -Backport from trunk (r9961, r10023, r10028, r10030, r10038, r10147):
- Fix: Some bits were unset when loading old TTD savegames when they shouldn't be unset (r10147)
- Fix: Sprite resulting from '?' substitution was reloaded into the cache entry for SPR_IMG_QUERY instead of the original sprite cache entry. This resulted in unaccounted missing sprite cache memory, and was exacerbated because the original missing sprite was not cached, so it did it again and again and again. Slowdowns and boom (r10038)
- Fix: One could build on (some) slopes when building on slopes was disabled [FS#823] (r10030)
- Fix: When deleting the first engine of a train with multiple engines, only reopen the train window if the player had the original train window open. This fixes 'random' windows opening for multiple players of the same company (r10028)
- Fix: When selling trains, if there were no wagons between multiheaded engines the rear part could be checked despite having already been deleted (10023)
- Fix: Some files were still in iso8859-15 instead of UTF-8 (r9961)

(svn r10152) [0.5] -Fix: MorphOS interprets // as /../, so do not add any duplicate slashes (tokai).

(svn r10151) [0.5] -Fix [FS#862]: train disconnects in some old TTD savegames.

(svn r10083) [0.5] -Fix [FS#836]: "Deactivate Electrified Railways" didn't work.

(svn r9977) [0.5] -Prepare 0.5 branch for release of 0.5.2.