bump to 0.6.2

Signed-off-by: BlackEagle <ike.devolder@gmail.com>
cleanup setting of parfilename, resolves #15

- Add SetParFilename method to commandline
- cleanup handling of setting the parfilename
- remove some obsolete tricks to set the parfilename

Signed-off-by: BlackEagle <ike.devolder@gmail.com>