Usage of `/var/run` causes issue in Debian because it's content is
purged on reboot. Replace usage of `/var/run` by `/var/lib`

Cherrypy need native str value. We need to provide the right type of
value depending on python version.

Update the ldap plugin to support required group statement. Using this
configuration, it's possible to limit access to rdiffweb to a specific
LDAP group.

Don't allow users with an expired account to authenticate in rdiffweb.

Enhance the notification plugin to notify the user when his email
address is changed.

- Add Logging parameter to config file so user can setup the logging
from command line or config file.
- Add a log level parameter to control the logging verbosity.
- Add Environment parameter to avoid printing stack trace to user.

plugins: LDAP and SQLite. MySQL is on the way.

Fix minor issue with deployment script. Redesign the pages with modification to templates and CSS. Add JQuery.