updated PPM repositories

* cf. RT #98764 & #98764
* bribes has PPms for Perl 5.14, 5.16, and 5.18, too
* at sisyphusion, I found PPMs for 5.16 and 5.18, too
* trouchelle now has a repo for Perl5.14
* unfortunately, Randy Kobes passed away and his repos  are dead by now
* wxperl provides PPMs for Perl 5.16, too, but the support for Perl 5.10
on Mac OS X is not listed on the web site anymore