Library update

I no longer reset the library before scanning.  This allows me to do a
basic form of updating.  Unfortunately, I have to manually select the
same directory to update it.  Eventually I should find a way of
automating library updates.

libsaria/collection/__init__.py

@@ -31,7 +31,6 @@ def new_source(path, bg=True):
 	path = expand(path)
 	if not exists(path):
 		return 0
-	library.reset()
 	return call("NEWSOURCE", library.scan, path)
 
 def walk_library():

libsaria/collection/lens.py

@@ -31,7 +31,6 @@ class Library(collection.Collection):
 	def scan(self, path):
 		print "Library scanning %s" % path
 		set_badfiles()
-		self.reset()
 		self.update(path)
 		self.save()
 		save(badfiles, "badfiles", "")
@@ -50,6 +49,7 @@ class Library(collection.Collection):
 	def update(self, path):
 		global badfiles
 		FileRef  = libsaria.collection.FileRef
+		find_id  = self.find_id
 
 		for root,dirs,files in walk(path):
 			stripped_root = root.strip(sep)
@@ -59,6 +59,8 @@ class Library(collection.Collection):
 				if ext in badfiles:
 					continue
 				path = join(root, file)
+				if find_id(path) != None:
+					continue
 				try:
 					ref = FileRef(path)
 				except: