- updated scripts etc
- make tests pass

Created a new class LodelSession to handle session datas
Created an automatic wrapper to acces to session handler plugin function throug SessionHandlerPlugin class methods
Bugfixes done for plugins. The plugin type is store in __plugin_type___ and not in __type__

Avoid useless impossible import by putting confpsec in a dedicated file

- renamed Plugins class to Plugin
- an instance represent a loaded plugin
- classmethod allows to preload & load plugins

- create_instance.sh create some symbolic links
- webui plugin that add webui configuration variable