(svn r3568) - Fix: constantizing side-effect of qsort in r3563. Ugly? Yes. Makes MSVC happy? Yes.

(svn r3567) -Fix: for once and for all, use 'unsigned long' if you want to cast something
from int-like to void *... we fixed that not too long ago, and the code below
this changed line clearly tells you do to that :p

(svn r3565) - Fix: On loading a game, GetPlayerRailtypes() didn't account for the fact that vehicles are introduced a year after their introduction date. This will also relieve possible (rare) network desyncs.

(svn r3564) Several smaller changes:
- Don't treat non-booleans as booleans
- Reduce variable scope
- Bracing
- Use DeMorgan's law to make conditionals easier to read
- if cascade -> switch
- Replace some magic numbers by symbolic names
- Avoid assignments within other statements

(svn r3563) Simplify the code for calculating the highscore table in network games and saving of old ecenomy data

(svn r3562) Remove pointless buffer copies

(svn r3561) Don't use FindLandscapeHeightByTile() when it's overkill. Also use a sprite enum instead of a magic number.

(svn r3560) Restore plural forms of cargo types for several languages.
I extracted the info from 2614:2615.
If you speak one of the languages, please check if the changes are correct.

(svn r3559) - CodeChange: simplify MKCOLOR(x) macro for smallmap_gui.c by adding a TO_LE32X() macro next to TO_BE32X(). The 'X' signifies them as macros and not-inline functions so they can be used in variable declarations.

(svn r3558) Add newgrf_callbacks.h to VS project files