log: add logging config after config parsing

* This allows for 5 new items in koublad.conf
   verbosity = info    #allowed: debug,info,warning,critical
   syslog_level = warning
   syslog_facility = user #every standard syslog facility available
   filelog_level = warning
   filelog_filename = /var/log/koublad.log

* Allowed values for levels and verbosity: debug,info,warning,critical
* Initial handler is still created for critical messages only.
Revert "just a reminder for tomorrow!"

This reverts commit 285c5d467ebc50e0669e319f1cd55e00d6bd8df2.