tools dtnoutbox: added ibrcommon Logger
tools io ObservedFile: added ibrcommon Logger
tools io FATFile: added ibrcommon logger
dtnoutbox: more logging
tools io ObervedFile: more detailed logging
tools dtnoutbox: added verbosity option, based on ibrcommon::Logger
Merge pull request #15 from dgoltzsche/logger

logging + verbosity option for dtnoutbox