have bootstrap_copy also in big staging prjs

Having a copy of the bootstrap repo is not strictly necessary but helps
to fix problems - and we can unify the handling of the prjs

Related issue: 1517
implement api call to get days since last freeze
don't allow select in an outdated (+7 days) project

and build enable the prj afterwards
Merge pull request #78 from openSUSE/coolo_1517

I will merge this, we can improve the visualization later.