fossil: update to 2.8

Changes for Version 2.8 (2019-02-20)

  *  Show cherry-pick merges as dotted lines on the timeline graph.
    The "fossil rebuild" command must be run to create and
    populate the new "cherrypick" table in the repository in order
    for this feature to operate.
  *  Add the ability to associate branches, check-ins, and tags with
    specially-named Wiki pages. This gives the ability to better
    document branches and tags, and provide more documentation on
    check-ins beyond the check-in comment.  The associated Wiki is
    automatically displayed on /info pages for check-ins, and on
    /timeline?r=BRANCH and /timeline?t=TAG pages for branches and
    tags. This feature is on by default, but can be disabled in on
    the Admin/Wiki page.
  *  Enhance the repository list page (shown for example by
    "fossil all ui") so that it shows the name and last check-in
    time for each project.  The implementation of the repository
    list page is now broken out into a separate source file (repolist.c).
  *  Allow users with Forum Supervisor permission ('6') to add Forum
    Write Trusted permission ('4') to users as they are approving a
    forum post by that user.
  *  When running a bisect, report the number of check-ins still in
    the search range and the estimated number of bisect steps remaining.
    Do this at each step of the bisect.
  *  Provide a permanent link to a bisect timeline using the bid= query
    parameter.
  *  Make the chronological forum display feature available to all users,
    and make it the default format on mobile devices.
  *  Break out Wiki setup into a separate /setup_wiki page, accessible
    on the standard menus through Admin/Wiki.
  *  Add "Next" and "Previous" buttons on the /wdiff page, allowing
    the user to step through the versions of a wiki page.
  *  Improve the display of the /whistory page.
  *  Omit the "HH:MM" timestamps on timeline graphs on narrow-screen
    devices, to improve horizontal space uses.  This helps make Fossil
    more mobile-friendly.
  *  Enhance /wcontent to show a sortable list of Wiki pages together
    with the number of revisions and the most recent change time for
    each page.
  *  Hyperlinks to Wiki pages on the /timeline go to the specific
    version of the Wiki page named in the timeline, not to the latest
    version.
  *  Enhancements to the "amend", "tag", and "reparent" commands, including
    adding options --override-date, --override-user, and --dry-run.
  *  Add the global --comment-format command-line option and the
    comment-format setting to control the display of the command-line
    timeline.
  *  Change the "fossil reparent" command so that it only works from
    within an active checkout.
  *  On the /setup_ucap_list, show administrators how many users have
    each capability.  The counts are a hyperlink to the /setup_ulist
    page showing the subset of users that have that capability.
  *  Provide the ability to redirect all HTTP pages to HTTPS.  Formerly
    one could cause this to occur for the /login page only.  That option
    still exists, but the redirect can now also be done for all pages.
  *  "Compress" the built-in javascript by omitting comments and
    leading and trailing whitespace.
  *  Detect when the repository used by a checkout is swapped out for
    a clone that uses different RID values, and make appropriate adjustments
    to the checkout database to avoid any problems.
  *  Add the backoffice-disable setting to completely disable the
    backoffice feature.
  *  Update the built-in SQLite to version 3.27.1.
  *  Various other small enhancements to webpages and documentation.

(gutteridge)