(svn r3213) - Codechange: Clean up handling of road stops, avoiding unnecessary use of pointers and using the *BIT() macros.

(svn r3212) - Waypoints/Depots: Store waypoint index in m2 for waypoints. This moves the ground type bits from m2 to m4 for waypoints and depots (leaving room for depot index in m2 in future), and moves the custom graphics ID to the waypoint struct.
- Waypoints: Until now stat_id was saved but never assigned to. Instead we now save the GRFID/local index of the custom graphics so that GRF file changes can leave graphics intact.

(svn r3211) Fix typo in r3181

(svn r3210) -Codechange: use IsRailWaypoint where possible (instead of magicnumbers)
-Codechange: IsRailWaypoint should take 'tile', not 'm5'

(svn r3209) In TileLoop_Track(), use names based on function rather than their place in the map array.

(svn r3208) Don't explicitly pass the engine type to look for to GetRearEngine(), because it's the engine type of the vehicle which gets passed as first parameter

(svn r3207) Typo in last revision

(svn r3206) Wrap all instances of _dbg_screen_rect in #ifdef _DEBUG

(svn r3205) Some more uses for GB/SB

(svn r3204) Make handling of clicking on vehicles a bit less ugly by avoiding function declarations in .c files and unnecessary indirection

(svn r3203) Directly use the currency symbols for pounds and yen in the language files like it's already done for dollar and euro

(svn r3202) If cascade -> switch

(svn r3201) -Fix: Allow bribing up to the maximum rating for bribing, don't disable this option at some arbitrary value early

(svn r3200) Remove the unused function GfxScalePalette() and the unused struct WorldSprite