libsaria: remove ids from playlist (improved!)

I moved this to my new file.  I grab the lock, remove each id, and then
unlock.

libsaria/sources/playlist/__init__.py

@@ -17,14 +17,7 @@ cur_index  = None
 
 # Function pointers for convenience
 add_ids = playlist.add_ids
-
-def rm_id(id):
-	playlist.song_list.remove(id)
-
-def rm_ids(ids):
-	for id in ids:
-		rm_id(id)
-	save()
+rm_ids  = playlist.rm_ids
 
 def init():
 	global library

libsaria/sources/playlist/playlist.py

@@ -15,6 +15,13 @@ def add_ids(id_list):
 	song_list.extend(id_list)
 	unlock_plist()
 
+def rm_ids(id_list):
+	lock_plist()
+	for id in id_list:
+		if id in song_list:
+			song_list.remove(id)
+	unlock_plist()
+
 def as_set():
 	lock_plist()
 	song_set = set(song_list)