(svn r1323) Adding autoreplace feature

This feature works much like autorenew, but it will get you a new engine type instead of a new one of the same type. Once 
ordered, it will automatically replace the engines while they visits a depot. The GUI for setting this up have been added on the 
vehicle overview windows
Note: autorenew is now autoreplace, but to the same engine type
Nice new features, that was added to make this possible
- windows can now have two independant vertical scrollbars
- CMD_SHOW_NO_ERROR have been added as a flag for DoCommandP. It will make it do the action instead of showing the red box with 
estimated costs even if shift is pressed
- fixed problem where enginetypes where not initialized when loading a game. It's now done in InitializeGame()

1 files changed, 1 insertions, 0 deletions

diff --git a/ttd.h b/ttd.h
index 35bcc6354..45880270f 100644
--- a/ttd.h
+++ b/ttd.h
@@ -439,6 +439,7 @@ enum {
 	WC_CLIENT_LIST = 0x49,
 	WC_NETWORK_STATUS_WINDOW = 0x4A,
 	WC_CUSTOM_CURRENCY = 0x4B,
+	WC_REPLACE_VEHICLE = 0x4C,
 };