Fix a typo

This should have been UNIVERSAL, not UNIVERAL.  I'm not sure why noone
ever noticed, perhaps because few people use this is_key logic.
Add some deprecation notices

Some of these functions were a bit crazy.  They were in support of
ideas which never went anywhere.  Mark them as deprecated and also
put warnings on the functions which are for internal convenience
only (a lot of these functions date back to before the real
alternatives were core)