libsaria: Reset library

This clears the entire library and creates an empty tag tree.

libsaria/sources/library/__init__.py

@@ -18,3 +18,7 @@ def update_lib():
 
 def num_visible():
 	return library.size()
+
+def reset():
+	library.reset()
+	tree.make_tree()

libsaria/sources/library/library.py

@@ -24,6 +24,13 @@ def load():
 def save():
 	storage.save_obj(LIB_FILE, lib_dict)
 
+def reset():
+	global lib_dict
+	lock_library()
+	lib_dict = {}
+	save()
+	unlock_library()
+
 def add_path(path):
 	lock_library()
 	lib_dict.setdefault(path, dict())