(svn r5946) -Add: merged the TGP branch to mainline. TGP adds:

- New optional landscape generator (TerraGenesis Perlin)
  - Load heightmaps (either BMP or PNG)
  - Progress dialog while generating worlds (no longer a 'hanging' screen)
  - New dialogs for NewGame, Create Scenario and Play Heightmap
    - Easier to configure your landscape
    - More things to configure (tree-placer, ..)
  - Speedup of world generation
  - New console command 'restart': restart the map EXACTLY as it was when you
      first started it (needs a game made after or with this commit)
  - New console command 'getseed': get the seed of your map and share it with
      others (of course only works with generated maps)
  - Many new, world generation related, things
  - Many internal cleanups and rewrites
  Many tnx to those people who helped making this:
     Belugas, DaleStan, glx, KUDr, RichK67, Rubidium, and TrueLight (alfabetic)
  Many tnx to those who helped testing:
     Arnau, Bjarni, and tokai (alfabetic)
  And to all other people who helped testing and sending comments / bugs
  Stats: 673 lines changed, 3534 new lines, 79 new strings

macros.h

@@ -180,4 +180,10 @@ static inline uint16 ReadLE16Unaligned(const void* x)
  */
 #define ALIGN(x, n) (((x) + (n) - 1) & ~((n) - 1))
 
+/** return the largest value that can be entered in a variable.
+ *  known to work for uint32.
+ *  used by TGP to set the max value of the _patches.generation_seed in its definition
+ */
+#define MAX_UVALUE(type) ((type)~(type)0)
+
 #endif /* MACROS_H */