Post status update notice change.
Revert "SECURITY FIX. Related to the one before. Stop users from deleting posts when they don't actually have delete access to that post."

The original commit was a bit overzealous.  There are many places in
system that cease to function properly when access control is checked on
every commit, and in particular, this commit causes all extant posts tests
to fail.  Instead, access control should be checked by the thing that's
calling the delete, not the delete function itself.

This reverts commit 9c57ef3ac9a203ddb8cb03cb6f85376739c292a9.
Revert "SECURITY FIX: Do not allow users to wildly delete users just because they are able to submit a form, for example because they have access to their own profile. Checking user edit access only on page access was a REALLY BAD IDEA."

The delete method on user should not check access control.  The things
calling delete should check access prior to calling it.  The code that was
calling delete previously has been completely rewritten to use FormUI
validators.

This reverts commit 5361a3919a2fbeb809ed8eee953835436b2d2cec.

Conflicts:
	classes/user.php