Another Transform todo: correct Undo names for using Transform.

Martin; I've added calls like:
	BIF_TransformSetUndo("Add Duplicate");
In advance of calling transform itself, to indicate that this is the
string name to be used for Undo, and also has to be done on ESC.
To make that possible I had to add a memset() to zero the global struct
TransInfo. Nicely done with if(Trans.mode==TRANS_INIT)

Not sure how this relates to setting constraints in advance... I always
found it tricky to work a non-initalized global struct. :)

source/blender/src/editmesh_tools.c

@@ -580,6 +580,7 @@ void extrude_mesh(void)
 		countall(); 
 		
 		/* individual faces? */
+		BIF_TransformSetUndo("Extrude");
 		if(nr==2) {
 			Transform(TFM_SHRINKFATTEN, CTX_NO_PET|CTX_NO_NOR_RECALC);
 		}