Administration settings / Split harvester and system settings

* Settings / Split Harvester and System configuration in 2 db tables
* System settings / Remove hierarchy : in order to add a new setting, 
  * add the new key/value in the settings table and it will be available in the admin and settings tree
  * add the translation in loc
  * (optional) If custom form is required for the setting, only update config/config.xsl.
  * ie. removed all xml/config.xsl xml/env.xsl and js/config to keep it simple 
* Settings / SMTP / Add username, password and SSL options