Minor update

This is a minor update for the Announcements module. An issue was found that would allow the edit pencils to be shown for unauthenticated users. The cause was found to be in a to broad check on edit permissions.

Also, in this release, two other minor issues were solved. Rendered links to linked content are now properly html encoded (making the module xhtml compliant), and a typo in the uninstall sql script which prevented the module to be uninstalled properly

This release is Azure compatible.