Minor improvements in migrations

fixtures/migrations/1.5.2.sql

@@ -1,7 +1,7 @@
 --
 -- Create table for news
 --
-CREATE TABLE ponyFiction_newsitem (
+CREATE TABLE IF NOT EXISTS ponyFiction_newsitem (
   id      INTEGER AUTO_INCREMENT NOT NULL PRIMARY KEY,
   title   VARCHAR(255)           NOT NULL,
   text    LONGTEXT               NOT NULL,

fixtures/migrations/1.5.3.sql

@@ -1,5 +1,5 @@
 --
 -- Migrate new registrations
 --
-ALTER TABLE stories.registration_registrationprofile ADD activated BOOLEAN DEFAULT FALSE NOT NULL;
+ALTER TABLE registration_registrationprofile ADD activated BOOLEAN DEFAULT FALSE NOT NULL;
 UPDATE registration_registrationprofile SET activated = TRUE WHERE activation_key = 'ALREADY_ACTIVATED';