Integration of Guilev2 branches into master

[David Kastrup]

Ok, this is likely predominantly my fault for not leaving the Guilev2
migration attempts in a sane and orderly state when my emotional energy
to keep working on them kept drained.

I propose that I am going to pick up the pieces of
not-actually-formally-reviewed patches making up the bulk of them and
put them, Guilev2-guarded (so that they don't affect Guilev1
compilations) into staging->master without going through the formal
processes.

The reason to do that is that the current state already likely wasted
considerable time of Han-Wen by finding solutions for problems that were
already previously turned into non-showstoppers although not necessarily
in the cleanest manner.  But it would seem that even if part of them is
likely to eventually be superseded, giving Han-Wen a better starting
place would make him work and plan more effectively.

-- 
David Kastrup
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