Disable the CSRF protection if we are in a development instance (to be able to do test and send post from tools).

Renamed conf->cookie_cryptkey into conf->file->cookie_cryptkey. The goal is to have all parameters defined inside file conf.php to be in $conf->file->xxx. Excep for database that are stored in $conf->db (historic reasons). This make code easier to understand and to know origine of a value (file or database).

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