refs: #14726 Added the possibility for users to edit their subscriptions

Unique check removed from _validate_subscription - any existing subscr. will be replaced
The portlet should set the "" location if clicked from inside portal_notification


git-svn-id: https://svn.eionet.europa.eu/repositories/Naaya/trunk/eggs@20296 a0171fae-0946-0410-966d-b1775066cd26
Released 3.3.4, new version 3.3.5

git-svn-id: https://svn.eionet.europa.eu/repositories/Naaya/trunk/eggs@20297 a0171fae-0946-0410-966d-b1775066cd26