Added the ability to delete or clear notifications.
* A "Clear all" button deletes them all (with confirmation)
* A "Remove" button on individual notifications (one confirmation per
page load, so you can remove several without too much tedium)
Fix some things regarding private photo notifications:
* When notifying your existing grants about a new upload, only users who
opt-in for Explicit are notified about Explicit private pictures.
* When revoking private grants, clean up the "has uploaded a new private
photo" notifications for all of your pics from their notification
feeds.
* Add photo upload quotas.
* Non-certified users can upload few photos; certified users more
* Fix foreign key issues around deleting user profile photos for psql
* Add the user photo gallery for profile pages. Paginated, grid or full (blog
style) view options. In grid view clicking a photo opens a large modal to
see it; full view already shows large photos.
* Edit page: can also re-crop and set an existing pic to be your profile pic.
* Delete page: remove photos from the DB and hard drive.
* Photos are cleaned up from disk when not needed, e.g. during a re-crop the
old cropped photo is removed before the new one replaces it.
* Fixed bug with cropping pictures.
