reduce verbosity of logging

[johanes]

Hello,

I am using Ubuntu 10.04 together with the shipped version of backintime which is 0.9.26. I've been looking through my syslog and have seen that backintime is very verbose. Would it be possible to add an option to choose the loglevel and store it in the configuration. Meanwhile I've just #ed the line in logger.py which logs INFO messages.

Something like
snapshots.log_verbosity=INFO, WARNING, ERROR
which reports only messages of the given or higher priority to the syslog.