Possibly allow for output redirection on mergediff

I'm making the executive decision to NOT include this in the menu for now because it's too cramped

SabreHelper/Build.cs

@@ -123,6 +123,7 @@ Options:
 	-b, --bare		Don't include date in file name
 	-u, --unzip		Force unzipping in created DAT
 	-o, --old		Output DAT in CMP format instead of XML
+	-out=			Output directory (overridden by --cascade)
 	-sd, --superdat		Enable SuperDAT creation
 	-n=, --name=		Set the internal name of the DAT
 	-d=, --desc=		Set the filename and description of the DAT