Remove now unused sql directory

sql/sites.sql

@@ -1,3 +0,0 @@
-alter table base_site rename to domains_domain;
-alter table base_sitemember rename to domains_domainmember;
-delete from south_migrationhistory;

sql/tags.sql

@@ -1,10 +0,0 @@
-CREATE OR REPLACE LANGUAGE plpython2u;
-
-CREATE OR REPLACE FUNCTION unpickle (data text)
-  RETURNS text[]
-AS $$
-    import base64
-    import pickle
-
-    return pickle.loads(base64.b64decode(data))
-$$ LANGUAGE plpython2u IMMUTABLE;