add easyconfigs for Circos + deps, including Perl update

depends on https://github.com/hpcugent/easybuild-easyblocks/pull/380 and  https://github.com/hpcugent/easybuild-easyblocks/pull/425 (sort of)
@wpoely86: it's available here (just google the file name) http://ftp.usa.openbsd.org/pub/OpenBSD/distfiles/

We could update all Perl modules listed here, but then it becomes a never-ending story... As it is now, the modules listed have the latest version available at the time when this was composed (i.e. shortly after Perl v5.18.2 was made available).

This again shows the need for an archiving solution of our own, since sources keep disappearing upstream...

An update of Perl and modules is available at https://github.com/hpcugent/easybuild-easyconfigs/pull/909 btw.