Major changes related with the February TODO list

Change Labels color to white
Define IdentificationNumber format: X-XXXX-XXXX
Store the values with upper case
The website validates if the IdentificationNumber is already registered,
it doesn't allow to re-add him/her.
Just the enabled user are displayed in the Users List
Change the authentication module: now it validates with the username:
IdentificationNumber and password: Generated code,