(svn r13676) -Fix [FS#2126]: inactive companies from old (TTD) saves could be marked active in some cases, which then loads garbage in their statistics and such.

(svn r13675) -Fix: memory leak when NewGRFs got forcefully disabled and they defined GOTO labels.

(svn r13674) -Fix [FS#2127]: crash when drawing a non-real sprite. The drawing of the non-real sprite is caused when two NewGRFs replace the same sprite and the first replaces it with a real sprite (and thus assumes it remains a real sprite) and the second replaces it with a non-real sprite. OpenTTD already looked at whether the sprite to load should be seen as a real or non-real sprite, but it failed to replace non-real sprites with a substitute real sprite when getting the sprite from the cache.

(svn r13673) -Fix [FS#2122]: desync when building electrified trains on a dedicated server that was started with electrification disabled.

(svn r13672) -Fix(r13670): silent warnings that MSVC did not raised. Looks like enums can not be easily matched :(

(svn r13671) -Cleanup: Zeros for sell.

(svn r13670) -Codechange : Merge some very alike events handlers.

(svn r13669) [NoAI] -Fix: allow clients only to join non-AI controlled companies in multiplayer

(svn r13668) [NoAI] -Add: execute 'game_start.scr' on game-start or scenario load, to allow you to load AIs on game-start
[NoAI] -Fix: -vnull acts a bit more like a dedicated server, to avoid weird complexity on several places

(svn r13667) -Documentation: Comment 'tgp.cpp' a bit. Based on patch by CommanderZ.