Add version of The Good Suite to forum sample

Currently, there is no way to specfy which version you want, so this is
the way I picked to make the Good Suite version unambiguous.

Once there is composer support, a simple number will instead suffice, but
until that time, this will have to do.
Bring compilation up to date
Bring bootstrap up to date
Fix naming issue

Issue originated when importing Good installation (I first tried to import
GoodLooking only, and thus it stayed still named differently after I
realized I needed the whole Good Suite rather than just it).
Bring forum backend up to date
Bring templates up to date

In some places some workarounds were necessary.