Signed-off-by: Codruț Constantin Gușoi <codrut.gusoi@gmail.com>

* Replace all ctx.Handle with ctx.ServerError or ctx.NotFound

* Change Handle(403) to NotFound, avoid using macaron's NotFound

* only update needed columns when update user

* fix missing update_unix column

* xxx_active_code_live setting in printed in hours and minutes instead of just hours

* Update app.ini description of xxx_code_lives settings

* Allow ENABLE_OPENID_SIGNUP to depend on DISABLE_REGISTRATION

Omit the configuration variable (the default) to be dependent.
Fixes #1363

* Move OpenID settings under Service object

* Show OpenID SignUp and SignIn status in admin panel / configuration