libsaria: Remove new_source() functions

I have new functions for creating the library, so this (and associated
callbacks) are no longer needed.

libsaria/callbacks.py

@@ -33,10 +33,6 @@ on_load_playlist = null_cb
 def load_playlist():
 	on_load_playlist()
 
-on_new_source = null_cb
-def new_source():
-	on_new_source()
-
 on_library_updated = null_cb
 def library_updated():
 	on_library_updated()

libsaria/sources/__init__.py

@@ -59,13 +59,6 @@ def set_attr(attr, value):
 		cur_source.set_attr(cur_id, attr, value)
 		cur_source.save()
 
-def new_source(path, bg=True):
-	path = expand(path)
-	if not exists(path):
-		return 0
-	oldlibrary.scan(path)
-	libsaria.callbacks.new_source()
-
 def make_library(path):
 	path = expand(path)
 	if not exists(path):