Log Message:
Update to 2.9.2:

This is a regularly-scheduled bugfix release.

    amend: save commit message into ".hg/last-message.txt"
    backout: correct commit status of no changes made (BC) (issue4190)
    backout: document return code of merge conflict
    commit: create new amend changeset as secret correctly for \ 
"--secret" option
    commit: propagate --secret option to subrepos (issue4182)
    convert: more clear documentation of the 'include' default of a 'include .'
    dispatch: only do import(debugger) when a debugger is requested
    log: solves bug regarding hg log -r 0:null (issue4039)
    hg: introduce "wirepeersetupfuncs" to setup wire peer by \ 
extensions (issue4109)
    hg: use "os.path.join()" to join path components which may be \ 
empty (issue4203)
    histedit: save manually edited commit message into \ 
".hg/last-message.txt"
    localrepo: save manually edited commit message as soon as possible
    merge: fix lack of "%s" in format string causing TypeError at runtime
    paper: overlapping of section title on help pages (issue4051)
    phase: say "Returns 0" instead of "Return 0" like other \ 
command help
    qfold: save manually edited commit message into ".hg/last-message.txt"
    qnew: save manually edited commit message into ".hg/last-message.txt"
    rebase: use "commitforceeditor" instead of "ui.edit()" \ 
for "--collapse"
    revset: document the regular expression support for tag(name)
    subrepo: add trailing newlines to warnings
    subrepo: convert matched string to integer before comparing Git version
    subrepo: only retrieve the first two components of the Git version
    tag: save manually edited commit message into ".hg/last-message.txt"
    templater: apply "stringify()" on sub expression to get string \ 
correctly
    templater: avoid recursive evaluation of string literals completely
    templater: make strings in template expressions be \ 
"string-escape"-ed correctly
    templater: raise error for unknown function