Update trkpkg list after perl modules changes.

  - I'm dropping ClusterSSH SlackBuild development as tehre is a much better one in slackbuild.org. Thanks to Lévai Dániel for providing it.

  - The new list comes after a complete perl cleanup: lots of perl modules was removed in favor of better manageable Slackware packages. CPAN alone is crap on doing this!
Update packages README.

  - Change workflow example to reflect the ClusterSSH development drop.

  - Add a complete dependency list for the sbopkg I keep. The list was created after a sqg run, which provides queue files with dependencies for every slackbuilds.org SlackBuild available that require some other package to build successfully. I just list these dependencies here and provide further instructions for the ones that do not want to build the packages by themselves (like myself in case of a disaster).
clusterssh: remove package.

  - Use the one from slackbuilds.org instead and be careful with the long list
    of dependencies it requires.