python api

removed most custom add_*data* wrappers from Main.c
removed makeCurrent() from Text.c (was never in a release), use "bpy.texts.active = text" now
clamp new image sizes
made add_empty_action accept a string rather then a blocktype since the blocktype was only being used to choose one of 3 strings anyway.

source/blender/src/editconstraint.c

@@ -90,7 +90,7 @@ ListBase *get_active_constraint_channels (Object *ob, int forcevalid)
 				if (!forcevalid)
 					return NULL;
 				
-				ob->action=add_empty_action(ID_PO);
+				ob->action=add_empty_action("Action");
 			}
 			
 			/* Make sure we have an actionchannel */