txt2man-1.6.0-bp151.1.1

- Modernise spec file using spec-cleaner

- Update to 1.6.0
  * txt2man: Format date with C locale (by @Vogtinator)
  * txt2man: Do not overwrite manually specified release with
    autoprobe (by @Vogtinator)
  * txt2man: man page spelling fixes (by @eribertomota)
  * bookman: Fix bashisms (by @eribertomota)
  * bookman, src2man, txt2man: support timestamps from environment
    (by @reinerh) (boo#1047218)

- Cleanup spec file

- Initial rpm release (version 1.5.6).