filesys()
  Scanner which uses filesystem scanners.
  
  Usage: filesys(prefix='/tmp/fs', logfile='', regexp='')
  
  Where: '/prefix' is a string, which defines directory
            and a part of filename to store scanned files,
            by default '/tmp/fs'
         'logfile' is a string, which defines full path and filename
            of logfile, by default not logfile used
         'regexp' is a string, which defines how to parse logfile
  
  New in version 0.7.0.