[development] replacing hook_user('form') with hook_form_alter()

[Moshe Weitzman]

hook_user('form') should probably be deprecated in favor of simple 
hook_form_alter() implementations. one wrinkle though is that 
hook_user('form') returns its fields in 'categories' which map to different 
tabs when editing a profile. do people think this multiple tab model is 
useful? if so, can modules achieve this in some way without help from 
user.module?

Any ideas on how to improve this?

-moshe