(svn r15027) -Merge: tomatos and bananas left to be, here is NoAI for all to see.

NoAI is an API (a framework) to build your own AIs in. See:
   http://wiki.openttd.org/wiki/index.php/AI:Main_Page
 With many thanks to:
  - glx and Rubidium for their syncing, feedback and hard work
  - Yexo for his feedback, patches, and AIs which tested the system very deep
  - Morloth for his feedback and patches
  - TJIP for hosting a challenge which kept NoAI on track
  - All AI authors for testing our AI API, and all other people who helped in one way or another
-Remove: all old AIs and their cheats/hacks

src/autoslope.h

@@ -32,14 +32,14 @@ static inline bool AutoslopeCheckForEntranceEdge(TileIndex tile, uint z_new, Slo
 /**
  * Tests if autoslope is enabled for _current_company.
  *
- * Autoslope is disabled for town/industry construction and old ai companies.
+ * Autoslope is disabled for town/industry construction.
  *
  * @return true iff autoslope is enabled.
  */
 static inline bool AutoslopeEnabled()
 {
 	return (_settings_game.construction.autoslope &&
-	        ((_current_company < MAX_COMPANIES && !_is_old_ai_company) ||
+	        (_current_company < MAX_COMPANIES ||
 	         (_current_company == OWNER_NONE && _game_mode == GM_EDITOR)));
 }