(svn r3371) -Fix: don't allow road-vehicles to perform an out-of-bound operation while overtaking in a curve (tnx to guru3, Tron and peter1138)
-Codechange: while at that, removed a local variable (more pretty :))

(svn r3370) Improve alignment of text within total cargo tab of train view window

(svn r3369) - Codechange: Replace tables _signals_table, _signals_table_other and _signals_table_both by the equivalent calls to rail.h functions.
- Codechange: Add a few constants.

(svn r3368) Fix the same type of off-by-one error when checking, if the passed coordinate is on the map, like in r3357, but this time in DoCommandP - *cough* code duplication *cough*

(svn r3367) Unify the 4 distinct CMD_CHANGE_{AIRCRAFT,ROADVEH,SHIP,TRAIN}_SERVICE_INT commands into one CMD_CHANGE_SERVICE_INT command.
As side effect this is a
-Fix: The default AI tried to change the service intervals of vehicles via the CMD_CHANGE_TRAIN_SERVICE_INT command - regardless of the type of the vehicle - which of course failed for non-trains

(svn r3366) Make an unnecessarily global variable local

(svn r3365) Staticise 36 functions

(svn r3364) Remove 3 unused functions (ScrollWindowToTile, AllocateWindowAutoPlace, AllocateWindowAutoPlace2)

(svn r3363) -Fix: 'fixed' the transfer problem. This doesn't really fix it, but gives a bit more fair amount of money. Can only be fixed correctly with CargoPackets as suggested in branch.

(svn r3362) Fix issue with loading old (TTD) savegames:
- move call to convert from old to new train subtypes.
- ensure AI is started for AI players.