Log Message:
Updated py-mercurial to 4.2.

Mercurial 4.2 release

1. Features

    Pager has moved from a bundled extension and into core.

        The in-core pager is on by default for any command that can produce long \ 
output.

        The pager extension is now deprecated. Please migrate off of it by \ 
removing extensions.pager from your configuration.
        If you have the pager extension enabled, it will override the in-core \ 
pager and will work as before.

        Unlike the pager extension, the in-core pager is disabled per underlying \ 
command, not per alias. This means that if you configure it to be off for log, \ 
it will be off for all aliases that use log. If you want paging e.g. for one \ 
log-alias but not for another, please keep the pager extension enabled for now.

        The in-core pager does not yet support attending commands that were not \ 
designed for it, so third-party extensions will not be paged until they have \ 
been updated to use the in-core pager. If you want paging for a command from a \ 
third-party command, please keep the pager extension enabled for now.

        See hg help pager for details.

    Color is now a core feature on by default. See hg help color for details.

        Set ui.color=never in your configuration to disable it.

        The color extension is now deprecated. Please migrate off of it by \ 
removing extensions.color from your configuration.

    The file content view on hgweb now allows you to select a range of lines and \ 
follow history of those lines over time.

    hg update and hg rebase can now be configured to abort if no destination was \ 
explicitly given. This can be useful if your workflow is such that the \ 
destination is hard to predict. Set configuration option \ 
commands.update.requiredest=1 and commands.rebase.requiredest=1 to enable them.

    hg status can now be configured to display the paths relative to the working \ 
directory. Set configuration option commands.status.relative=1 to enable that.

    hg update learned to update across branches with a dirty working directory \ 
with --merge.

    A new rev fileset has been introduced to evaluate a fileset in the context \ 
of specific revision.

    A new status fileset has been introduced to simulate hg status between \ 
revisions and select files with desired properties. For example, to find files \ 
not modified between revisions 3.0 and .: hg files 'set:status("3.0", \ 
., clean())'

    A bundlespec help topic has been added. It documents the syntax used to \ 
define what is in a bundle file.

    Clients can now define the path to a file containing cookies that should be \ 
sent in HTTP requests. See hg help config.auth.cookiefile.

2. Bug fixes

    Aborts from an HTTP server are now properly reported back to the client \ 
instead of resulting in a 500 return code (f3807a135e43)
    lock: remove possible confusion between pid from different namespace \ 
(1f151a33af8e)
    color: fix handling of nested color (issue5413)
    template: cleanly reject invalid argument passed to pad()
    template: make pad() strip color codes before computing width (issue5416)
    graphlog: properly display multiple edges towards null node (issue5440)
    addremove: significant speedup on large repository (d3e2af4e0128, 985a98c6bad0)
    fileset: significant speed up on large repository (992882cef7e1)
    curses: fix the interactive hunk selection user interface on windows (issue5512)
    hgwebdir: allow a repository to be hosted at "/"
    bundle2: ignore errors seeking a bundle after an exception (issue4784)
    templatefilters: fix crash by string formatting of '{x|splitlines}'

3. Improvements

    merge: print message before launching external merge tool (4d019d0e1b3b),
    profiling: add statprof support for Chrome trace viewer rendering (517bc1cd7033),
    hg: allow usage of $XDG_CONFIG_HOME/hg/hgrc (354020079723),
    matcher: adds a new rootfilesin: matcher type. It matches files inside a \ 
directory, but not any subdirectories.
    sslutil: issue warning when [hostfingerprint] is used. The [hostsecurity] is \ 
better in everyway.
    pager: improve error reporting when calling out to page (issue5491)
    documentation: various improvements
    hgweb: use monospace font for commit messages in gitweb theme
    template: provide loop counter as "index" keyword
    template: add support for keyword arguments
    template: introduce new hybridlist and hybriddict function and the ability \ 
to define a dict in a template
    hg: hardlink is enabled more widely on some filesystems, to speed up certain \ 
operations.

4. Extensions

    bugzilla: add a REST API backend (usable with Bugzilla 5.0+) (78de43ab585f),
    blackbox: allow to log time spent blocked (eg: waiting on user input) using \ 
the ui.logblockedtimes = on config option,
    shelve: add -n/--name option to unshelve (issue5475)
    patchbomb: add config knob to generate flags by template (issue5354)
    rebase: fix a bug where public changeset could still be rebase in if the \ 
rebase set had multiple roots,
    rebase: fix rebase possible rebase crash when working directory parent is \ 
obsolete (issue5219) (<1> not sure if we should include stuff touching \ 
experimental feature)
    patchbomb: use a single pager to display all output from -n/--test (BC)
    mq: reject new patch name containing leading/trailing whitespace
    convert: fix the handling of empty changlist descriptions in P4
    largefiles: set the extension as enabled locally after a share requiring it