Debian and RHEL packaging

On @alfbr request, here is debian and rhel packaging (again......)

it relies on patchery. based on previous experiences, i won't waste any more of my time on this. you are free to fix your tree or not, all up to you.

the patches address two issues;
1) using system ERT + dealing with the fact that the internal copy is outdated
2) documentation installation directories differ on redhat/debian

i'll push to the opm ppa/yum repo once i have a tag.