(svn r1817) -Codechange: Moved depot-functions to depot.c

-Codechange: Added wrappers around depot-access (GetDepot no exists)
-Codechange: Made depot-functions a bit more logic (no longer 
GetDepotByTile crashes your game when you request it on a non-depot tile)
-Add: made depots dynamic (yes, 64k depots are possible now)

ttd.dsp

@@ -465,6 +465,10 @@ SOURCE=.\console.h
 SOURCE=.\debug.h
 # End Source File
 
+# Begin Source File
+SOURCE=.\depot.h
+# End Source File
+
 # Begin Source File
 SOURCE=.\economy.h
 # End Source File
@@ -711,6 +715,10 @@ SOURCE=.\aircraft_cmd.c
 SOURCE=.\clear_cmd.c
 # End Source File
 
+# Begin Source File
+SOURCE=.\debug.c
+# End Source File
+
 # Begin Source File
 SOURCE=.\disaster_cmd.c
 # End Source File