- logging configuration now no longer overwrites the default log level

- logging configuration now no longer overwrites the default log level as specified in conf/logging/simplelogger.properties (see [MNG-2570] (http://jira.codehaus.org/browse/MNG-2570) (related)); the default log level was always set to "info" unless either option "debug" or "quiet" were used; this made it effectively impossible to change the default log level to something other than "debug", "error" or "info"