FreeNAS Code

for some reason we need to check unique constrain on user add
unique="True" as a string was preventing that column to be unique

keep old label for submit button post-submit for Change Password

Use correct name in copyright

remove legacy and fix a few typos with the help of pylint

Constrain GUI to what the OS will allow. Fixes ticket 474

Add _plural to models

add email field for users and migrate admin user email to root email

Promote feedback to trunk.

do not remove a group with the same name of a user while removing the user, instead try to remove his primary group _only_ if the group is not used anywhere else (#334)
also, first try to find a group with the same name as the user for his primary group if none is specified before blindly create it

PEP8 compliant; remove legacy unused code; bugfixes
Special thanks to Chyssler for pointing them out