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remotefilelog: adapt the `debugindex` command to past API changes

Pytype was missing these problems because it's currently inferring the classes
for `filelog` and `revlog` to be `Any`.  When that's fixed, these were flagged,
so fix these first.

The `filelog` class used to subclass `revlog`, but that was changed back in
1541e1a8e87d (with most or all of the "lost" attributes being forwarded to the
embedded `revlog` attribute at that time).  These forwarded references were
dropped over time, and this command has been broken at least as far back as
68282a7b29a7 when the `version` field was dropped.  Most of the fixes were as
simple as calling the accessor for the embedded `revlog` member, but the general
delta feature detection was a bit more involved- I copied the detection for it
from `mercurial.revlogutils.debug.debug_revlog()`.

#!/usr/bin/env python3
#
# An example hgweb CGI script, edit as necessary
# See also https://mercurial-scm.org/wiki/PublishingRepositories

# Path to repo or hgweb config to serve (see 'hg help hgweb')
config = b"/path/to/repo/or/config"

# Uncomment and adjust if Mercurial is not installed system-wide
# (consult "installed modules" path from 'hg debuginstall'):
# import sys; sys.path.insert(0, "/path/to/python/lib")

from mercurial import demandimport

demandimport.enable()
from mercurial.hgweb import hgweb, wsgicgi

application = hgweb(config)
wsgicgi.launch(application)