Log Message:
Update to 2.0:
1.1. Major features
    New core graft command (similar to transplant extension)
    New largefiles extension

1.2. Core changes

    commit: abort when there are uncommitted subrepos, use the -S option to recurse
    help: most commands now have usage examples with help -v
    import: add --edit switch
    revset: add more keywords for bisection
    revert: introduce short option -C for --no-backup
    log: add new 'bisect' style that prints the bisection status
    hgweb: add a "web/logoimg" setting to customize the web logo image
    subrepo: pull revisions on demand when archiving hg subrepos

1.3. Extension changes

    color: add styles for tags
    convert: added bookmarks support in filemap
    eol: add new eol.fix-trailing-newline setting
    eol: eol.only-consistent can now be specified in .hgeol
    export: add %m to file format string (first line of the commit message)
    mq: make qqueue print current queue name
    rebase: add --edit switch
    rebase: add --rev option to rebase
    rebase: allow rebase on ancestor
    share: introduce unshare command
    transplant: add --edit option

1.4. Bug fixes

    alias: don't shadow commands that we only partially matched (issue2993) (BC)
    commit: suppress spurious new head message for duplicate commit (issue2893)
    contrib: some support for named branches in zsh_completion (issue2988)
    progress: add a changedelay to prevent parallel topics from flapping (issue2698)
    rebase: allow rebase to ancestor (issue3010)
    rollback: avoid unsafe rollback when not at tip (issue2998)
    subrepo: fix git branch tracking logic (issue2920)
    subrepo: fix repo relative path calculation for root directories (issue3033)
    summary: show bookmarks separate from tags and note active mark (issue2892)
    util: wrap lines with multi-byte characters correctly (issue2943)
    verify: filter messages about missing null manifests (issue2900)
    wireproto: do not call pushkey module directly (issue3041)
    auth: fix realm handling with Python < 2.4.3 (issue2739)
    diffstat: be more picky when marking file as 'binary' (issue2816)
    dirstate: don't fail when dropping a not-tracked file (issue3080)
    grep: correct handling of matching lines without line ending (issue3050)
    hgweb: fix dynamic date calculation not working under Safari
    mq: avoid data loss upon qfold + qmv (issue3058)
    setup: set whole env for running hg even if .hg doesn't exist (issue3073)