Corrected for PHP 5.3 operation
Don't allow password recovery for disabled users
* Email verification / activation process corrected (when enabled)
* Verification no longer indicates failure if it's already been done but the key is still valid
* Verification email reissued if password recovery attempted when account not yet verified
* Corrected English in various messages / emails
* Changed the Invalid Username / password message to indicate the account could also be inactive
Provides different (more helpful) logon failure messages when the user is inactive / disabled. This addresses Yii-usr issue #34
Note this also backs out a previous change to the login failure message (where it included a user being inactive as a reason for failure) as that is no longer necessary with this change
Allow backwards compatibilty with UserIdentities that haven't implemented extended authentication failure codes
decoupling of example identity class with module; remove 'defined' and 'constant' ops from LoginForm and use CUserIdentity::errorMessage property; small code formatting fixes