Updated the doxygen config files
Updated the README file
Bugfix in logfile handling

SvxLink would crash if the filesystem was full while trying to write to
the logfile.
Bugfix in RemoteTrx log handling

RemoteTrx would crash if the filesystem was full while trying to write
to the log file. Same fix as in SvxLink Server implemented in RemoteTrx.
Merge branch 'master' into rtl