LDAP On-the-fly user creation : #602
Print the good message when an error occurs
Send an appropriate email in case of an account is created or asked
warm the user (on the login page) with a message like "You will receive a confirmation email, but you must wait until an administrator enable your account" (this message is already part of the locale file) only when the activation is manual .
Merge remote-tracking branch 'origin/dev' into dev

Conflicts:
	app/controllers/users_controller.rb
LDAP On-the-fly user creation : #602
Print the good message when an error occurs
Send an email in case of