Perl and BioPerl easyconfigs

This finishes the work done by @JensTimmerman in #236.

He agreed that I would open a new PR for this, which includes my commits on top of his work, since he won't be able to review a PR to his repo in the coming days.

A non-bare Perl easyconfig for `ictce` is missing because it was not sufficiently tested yet, will be added later (post v1.4).