Add a 'latin_name' field to the user profile so we can better support
those developers with names in non-Latin scripts, and yet still show a
Latin name as necessary on the developer profile page. This field only
shows up if populated.

Also, use consistent sorting everywhere- rather than using username,
always use first_name and last_name fields.

Signed-off-by: Dan McGee <dan@archlinux.org>