make db upgrade work

to use this branch:
===================

- git co master
- ./run_regression -> abort during tests
- git co multiple_email
- ./dba/update-davical-database --dbname=regression

dba/appuser_permissions.txt

@@ -26,6 +26,7 @@ GRANT SELECT,INSERT,UPDATE,DELETE
   ON freebusy_ticket
   ON usr
   ON usr_setting
+  ON usr_emails
   ON roles
   ON role_member
   ON session

dba/patches/1.3.4.sql

@@ -27,7 +27,7 @@ INSERT INTO usr_emails (user_no, email)
     SELECT user_no, email FROM usr WHERE email IS NOT NULL AND email <> '';
 
 ALTER TABLE usr
-    DROP COLUMN email;
+    DROP COLUMN email CASCADE;
 
 -- http://blogs.transparent.com/polish/names-of-the-months-and-their-meaning/
 SELECT new_db_revision(1,3,4, 'Kwiecień' );