Prepare to release 3.0 version

Updated manpage and README

Updated manpage and README

Fix the path for Perl

Patch from Debian (20_fix-perl-path.patch)
Description: fix the path for Perl.
 See Debian Policy '10.4 Scripts'.
Author: Joao Eriberto Mota Filho <eriberto@debian.org>
Last-Update: 2018-11-20

Imported version 2.5201

 r246@raven: kat | 2008-05-04 13:45:27 +1000

 New version 2.51

 r63@raven: kat | 2007-12-22 18:53:32 +1100

 version 2.50

 r2169@colbrand: kat | 2007-11-10 00:09:53 +1100

 Tweaking docs.