convert between Perl data structures, YAML and JSON with unicode support (I believe ...)

Changes for 0.27 - 2024-03-14T11:00:00Z

• Chnaged the shortcut command-line interface for the provided scripts so that -r is equivalent to --terse and -d is equivalent to --indent. Replaced 'warn()' with 'print STDERR'. In eval()'ing code which dies (e.g. my $res = eval { YAML::PP::Dump($pv) }; ) I have used this 'if( $@ || ! defined($res) )' which now became if( ! defined($res) )'.