GitLab

Mostly the same as FreeBSD, except for swap usage

The previous version was slightly misleading, the reader could
understand it the queries would be just slow as answered from the DB,
instead of not answered at all.

since the b10-showtech had not been released yet, I just replaced its name in the existing changelog entry

also changed the category from bug to build (it was definitely not a bug).
okayed on jabber.

Which is still used in some places.

Describe the data sources in the guide.