Log Message:
Update to 1.8.3:

This is a regular time-based bugfix release.

    convert: make filemap prune useless branch closing revs (issue2774)
    encoding: avoid localstr when a string can be encoded losslessly (issue2763)
    extdiff: fix broken symlinks handling (issue1909)
    help config: explain that config files do not exist by default
    hgweb: add bookmark labels to gitweb theme
    hgweb: add missing bookmarks definition to coal/map
    hgweb: add missing bookmarks templates to atom/rss styles
    hgweb: add separate bookmarks listing to gitweb theme
    hgweb: add separate bookmarks listing to monoblue theme
    hgweb: detect change based on changelog size too
    hgweb: fix inconsistant display of graphlog (issue1706)
    hgweb: fix typo and inactive link in page_nav and page_header of gitweb's help
    hgweb: fix typo in page-header of monoblue's help template
    hgweb: format page_nav of gitweb/error.tmpl and add missing links
    rebase: don't mark file as removed if missing in parent's manifest (issue2725)
    subrepo: handle svn tracked/unknown directory collisions
    subrepo: prevent url normalization from removing // in ssh paths (issue2556)
    subrepo: tell Subversion when we are non-interactive (issue2759)
    url: use a regex to hide unsupported ssh passwords (issue2754)
    zeroconf: notify the Zeroconf threads when hg exits