Admin password become a passkey for all active logins
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Functionality :
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    * Administrator has now the possibility to login in with any login;
    * By default, OpenERP will send a mail to user and admin to indicate them;
    * If a user and the admin have the same password, admin will be informed;

Technical information :
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    * Create two ir_config_parameter to enable / disable mail sending;

Copyright, Author and Licence :
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    * Copyright : 2014, Groupement Régional Alimentaire de Proximité;
    * Author : Sylvain LE GAL (https://twitter.com/legalsylvain);
    * Licence : AGPL-3 (http://www.gnu.org/licenses/)