! Accept 7 digit user ids in cookies, fixes #807. Also refined the regex to not accept string ids at the same time since they should now always be ints. There's a slight performance boost but saving 2 bytes every single request before gzip seems like a good idea to me. NB: Users of test sites will find themselves logged out and will need to log back in again just for the first time (to fix the cookie).

Signed-off-by: Peter Spicer <sleeping@myperch.org>