fossil: update to version 2.9

Changes for Version 2.9 (2019-07-13)

  *  Added the [/help?cmd=git|fossil git export] command and instructions
    for [./mirrortogithub.md|creating a GitHub mirror of a Fossil project].
  *  Improved handling of relative hyperlinks on the
    [/help?cmd=/artifact|/artifact] pages for wiki. For example,
    hyperlinks and the lizard <img> now work correctly
    for both [/artifact/2ff24ab0887cf522] and
    [/doc/0d7ac90d575004c2415/www/index.wiki].
  *  Enhancements to the timeline graph layout, to show more information
    with less clutter.
  *  Added tool-tips to the /timeline graph.  On by default but can be
    disabled by setting the "Tooltip dwell time" to 0 in the timeline
    configuration.
  *  Copy buttons added to various check-in hash and branch name links.
  *  Double-clicking on a /timeline graph node now jumps to the /info page
    for the check-in.  So, repurpose the timestamp hyperlink to show all
    activity around that check-in in time.
  *  Added the [/help?cmd=touch|fossil touch] command, and the --setmtime
    option on the [/help?cmd=open|fossil open] and
    [/help?cmd=update|fossil update] commands.
  *  Many documentation enhancements.
  *  For the "[/help?cmd=update|fossil update]" and
    "[/help?cmd=checkout|fossil checkout]" commands, if a
    managed file is removed because it is no longer part of the target
    check-in and the directory containing the file is empty after the
    file is removed and the directory is not the current working
    directory and is not on the [/help?cmd=empty-dirs|empty-dirs]
    list, then also remove the directory.
  *  Update internal Unicode character tables, used in regular expression
    handling, from version 11.0 to 12.1.
  *  In "[/help?cmd=regexp|fossil regexp]", "[/help?cmd=grep|fossil grep]"
    and the TH1 "regexp" command, the -nocase option now removes multiple
    diacritics from the same character (derived from SQLite's
    remove_diacritics=2)
  *  Added the [/help?cmd=/secureraw|/secureraw] page that requires the
    complete SHA1 or SHA3 hash, not just a prefix, before it will deliver
    content.
  *  Accept purely numeric ISO8601 date/time strings as long as they
    do not conflict with a hash.  Example: "20190510134217" instead of
    "2019-05-10 13:42:17".  This helps keep URLs shorter and less
    complicated
  *  Support both "1)" and "1." for numbered lists in markdown, as
    commonmark does.
  *  The sync and clone HTTP requests omit the extra /xfer path element
    from the end of the request URI. All servers since 2010 know that
    the HTTP request is for a sync or clone from the mimetype so the
    extra path element is not needed.
  *  If an automatic sync gets a permanent redirect request, then update
    the saved remote URL to the new address.
  *  Temporary filenames (for example used for external "diff" commands)
    try to preserve the suffix of the original file.
  *  Added the [/help?cmd=/thisdayinhistory|/thisdayinhistory] web page.
  *  Enhanced parsing of [/help?cmd=/timeline|/timeline] query parameters
    "ymd=", "ym=", and "yw=".  All arguments are option (in which case they
    default to the current time) and all accept ISO8601 date/times without
    punctuation.
  *  Automatically disapprove pending moderation requests for a user when
    that user is deleted.  This helps in dealing with spam-bots.
  *  Improvements to the "Capability Summary" section in the
    [/help?cmd=/secaudit0|Security Audit] web-page.
  *  Use new "ci-lock" and "ci-lock-failed" pragmas in the
    [./sync.wiki|sync protocol] to try to prevent accident forks
    caused by concurrent commits when operating in auto-sync mode.
  *  Fix a bug ([https://www.fossil-scm.org/forum/forumpost/c51b9a1169|details])
    that can cause repository databases to be overwritten with debugging
    output, thus corrupting the repository. This is only a factor when
    CGI debugging is enabled, and even then is a rare occurrence, but it is
    obviously an important fix.

(gutteridge)