It's a subtle difference, but an important one: "past" implies that
those practices are no longer used, whereas "historical" merely means
that they have historically been used (while not implying, or at least
not implying nearly so strongly, that they are no longer used today).

Many changes across the entire document, commenting out some material
and editing other material, in order to make an internal draft version
for sharing with OSI.

KDE presents this as a series of png files on their site, which is less
convenient that assembling that into a PDF.  But we don't have
permission to distribute an assembled PDF, so instead we have a script
that lets a user take the png files and make their own PDF.

As per conversation with Alex Scammon.