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truelight

(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

Ships:
======
Set the YAPF (Yet Another Path Finder) type in the "Configure Pathes/Vehicles/YAPF for ships":
 - 0 - No YAPF (NPF or old PF)
 - 1 - YAPF type 1 (Node = Tile/Trackdir, 90 deg. turns allowed)
 - 2 - YAPF type 2 (Node = Tile/ExitDir , 90 deg. turns allowed)
 - 3 - YAPF type 3 (Node = Tile/Trackdir, no 90 deg.)
 - 4 - YAPF type 4 (Node = Tile/ExitDir , no 90 deg.)


Set the "npf_max_search_nodes" value in your openttd.cfg to tune the pathfinder behavior.
This value tells, how many nodes (Tile/Trackdir or Tile/ExitDir) combinations the pathfinder
should visit before it ends. The lower number would mean quicker, but less accurate results.
The "npf_max_search_nodes" value is shared between NPF and YAPF and has the same meaning.

The pathfinder without such limit would be unusable on large maps, where number of visited
nodes can exceed 10 milions. NPF on my machine (dual code AMD 4400+) with 1 milion of nodes
visited took 2 minutes to finish, but with this limit set to 10000 it takes 20 miliseconds.
The new YAPF had similar results (18 seconds vs. 4 miliseconds).


Road Vehicles:
==============
Set the YAPF (Yet Another Path Finder) type in the "Configure Pathes/Vehicles/YAPF for road vehs":
 - 0 - No YAPF (NPF or old PF)
 - 1 - YAPF type 1 (Node = Tile/Trackdir, 90 deg. turns allowed)
 - 2 - YAPF type 2 (Node = Tile/ExitDir , 90 deg. turns allowed)

Trains:
=======
Same types as for ships:
 - 0 - No YAPF (NPF or old PF)
 - 1 - YAPF type 1 (Node = Tile/Trackdir, 90 deg. turns allowed)
 - 2 - YAPF type 2 (Node = Tile/ExitDir , 90 deg. turns allowed)
 - 3 - YAPF type 3 (Node = Tile/Trackdir, no 90 deg.)
 - 4 - YAPF type 4 (Node = Tile/ExitDir , no 90 deg.)