(svn r1712) - Fix: a hacked client can no longer send other players trains to a depot

- Feature: [autoreplace] trains now tries to find a depot if they needs to be replaced

Now all 4 types of vehicles goes to a depot if they needs to be replaced

(svn r1711) - Add: [MacOSX] Added an Xcode project file (Tobin)

This project file adds a graphical IDE to OSX, including graphical debugging, which is a bit easier than gdb (Xcode uses gdb for debugging)
Since it uses the makefile to compile, it should (hopefully) work without updating the project file when the makefile is updated
Tobin did most of the work, but I altered paths and settings for custom executable so it should work out of the box for everybody

(svn r1710) - Fix: [autoreplace] vehicles do no longer go to a depot all the time if the owner clicked 'stop replacing' ( ship+aircraft+road vehicles )

(svn r1709) - Feature: [autoreplace] ships now automatically goes to a depot if they need to be replaced

(svn r1708) - Fix: FindNearestHangar() will no longer return a hangar where a jet will crash if it is a jet, that is searching
- Codechange: Since planes move in strait lines in 8 directions, GetTileDistAdv() is used instead of manhatten distance in FindNearestHangar()

(svn r1707) - Feature: [autoreplace] road vehicles now tries to find a depot if they needs to be replaced

(svn r1706) Implement ScaleByMapSize() and ScaleByMapSize1D()
These scale a number relative to the map size/circumference.
Use them to scale the amount of map objects.
Of course at the moment they return just the input, because there are no bigger/smaller maps yet.

(svn r1705) Sign owner variable is a byte, not int32 of course

(svn r1704) - Fix: [newgrf] rotors of custom helicopters are displayed correctly in the hangar window

(svn r1703) - Fix: Scrolling with the arrow keys is now smooth and it now also scrolls exactly in tile direction if e.g. up and left are pressed