hgweb: pass a sysstr to low-level _start_response method
This fixes a regression in Python 3 support introduced in
7de7bd407251
on the stable branch. We're so early in do_hgweb that I don't see any
especially better choices than this.
Differential Revision: https://phab.mercurial-scm.org/D3726
tests: fix printenv script on Python 3
Differential Revision: https://phab.mercurial-scm.org/D3725
cvsps: port changeset __repr__ to py3
This appears to be unused except as a debugging aid, as it didn't
break until I added a debug print() in service of the previous
fix. Sigh.
Differential Revision: https://phab.mercurial-scm.org/D3724
cvsps: avoid comparison between None and a tuple in date sorting
Avoids badness on Python 3. I had to figure out which entries in this
object *could* be None experimentally, but I think I've got them all
now.
Differential Revision: https://phab.mercurial-scm.org/D3723