(svn r12867) [0.6] -Backport from trunk r12706, r12642, r12622, r12572, r12542:

- Fix: Do not crash very hard on unrecognised savegames, just go back to the intro menu instead (r12706)
- Fix: Remove buggy buoys at tile 0 from old TTDP savegames (r12642)
- Fix: Infinite loop in case your compiler decides that enums are unsigned by default (r12622)
- Fix: min() has 32bit arguments, clamping of 64bit values did not work (r12572)
- Fix: Do not install scenarios into the current user's homedir when running 'make install', that is silly. Simply always install scenarios system wide instead (r12542)

src/oldloader.cpp

@@ -1694,6 +1694,12 @@ bool LoadOldSaveGame(const char *file)
 
 	fclose(ls.file);
 
+	/* Some old TTDP savegames could have buoys at tile 0
+	 * (without assigned station struct)
+	 * MakeWater() can be used as long as sea has the same
+	 * format as old savegames (eg. everything is zeroed) */
+	MakeWater(0);
+
 	_pause_game = 2;
 
 	return true;