Implemented pkg for Solaris 11 package manager

Hello,
Solaris 11 included a new package manager "pkg". Its Solaris first management with a central repository (called publisher). Even with backward compatibility to svr4 packages (with the module "svr4pkg"), you should use the new feature.

I implemented the 3 standard-features 'present', 'latest' and 'absent' to work with the setup repositories.