Log Message:
Update to 2.2:

1. Mercurial 2.2 (2012-05-01)

This is a regularly-scheduled feature release. The most notable
feature is a new safe '--amend' option for commit using our new
phases infrastructure. There are also a number of signficant
performance improvements for large repositories and improvements
for case-folding filesystems. See UpgradeNotes for minor compatibility
notes.

1.1. Core features

    commit: add --amend option
    fileset: add "subrepo" fileset symbol
    graft: add --dry-run support (issue3362)
    hgweb: add support for branch width and color settings
    hgweb: add block numbers to diff regions and related links
    hgweb: support multi-level repository indexes by enabling descend and collapse
    merge: improve performance with lots of unknown files
    parsers: incrementally parse the revlog index in C
    plan9: add support for plan9
    push/pull: improve performance for partial transfers
    push: decompress in larger chunks for better performance on the server
    clone: add server config option to prefer uncompressed clone
    revert: add support for reverting subrepos
    revset: add "matching" keyword
    store: speed up read and write of large fncache files
    ui: optionally quiesce ssl verification warnings on python 2.5

1.2. Extension features

    bugzilla: add xmlrpcemail submission for Bugzilla 3.6 email interface
    bugzilla: allow change comment to mark bugs fixed
    bugzilla: extract optional hours from commit message and update bug time
    bugzilla: modify access interface to include new bug states
    graphlog: add all log options to glog command
    patchbomb: add --body flag to send patches as inline message body text
    record: allow splitting of hunks by manually editing patches
    transplant: permit merge changesets via --parent

1.3. Fixes

    alias: fix shell alias documentation (issue3374)
    archive: make it work with svn subrepos (issue3308)
    branchmap: server should not advertise secret changeset in branchmap (Issue3303)
    clone: always close source repository (issue2491)
    commit: abort on merge with missing files (BC)
    config: discard UTF-8 BOM if found
    convert/bzr: convert all branches (issue3229) (BC)
    convert/bzr: expect unicode metadata, encode in UTF-8 (issue3232)
    convert/bzr: handle empty bzr repositories (issue3233)
    convert/bzr: ignore nested repos when listing branches (issue3254)
    convert/svn: do not try converting empty head revisions (issue3347)
    convert/svn: make svn sink work with svn 1.7
    convert: support non-annotated tags in git backend
    dirstate: preserve path components case on renames (issue3402)
    export: catch exporting empty revsets (issue3353)
    icasefs: make case-folding collision detection rename aware (issue3370)
    inotify: catch SignalInterrupt during shutdown (issue3351)
    journal: use tryread helper to backup files (issue3375)
    largefiles: fix cat for largefiles (issue3352)
    largefiles: fix status -S reporting of subrepos (issue3231)
    largefiles: hide .hglf/ prefix for largefiles in hgweb
    largefiles: notice dirty large files in a subrepo
    largefiles: only update changed largefiles when transplanting
    largefiles: optimize update speed by only updating changed largefiles
    localrepo: add setparents() to adjust dirstate copies (issue3407)
    mdiff: fix diff header generation for files with spaces (issue3357)
    merge: check for untracked files more precisely (issue3400)
    merge: fix unknown file merge detection for case-folding systems
    patch: be more tolerant with "Parent" header (issue3356)
    patch: be more tolerant with EOLs in binary diffs (issue2870)
    patch: fix patch hunk/metdata synchronization (issue3384)
    phase: when phase cannot be reduced, hint at --force and return 1 (BC)
    posix: disable cygwin's symlink emulation (BC)
    posix: ignore execution bit in cygwin (issue3301)
    pure/osutil: use Python's msvcrt module (issue3380)
    rebase: preserve mq series order, guarded patches (issue2849)
    rebase: skip resolved but emptied revisions
    revset: fix O(n**2) behaviour of bisect() (issue3381)
    revset: fix adds/modifies/removes and patterns (issue3403)
    revset: fix alias substitution recursion (issue3240)
    subrepo/svn: abort on commit with missing file (issue3029)
    subrepo/svn: fix checked out rev number retrieval (issue2968)
    subrepo: fix default implementation of forget() (issue3404)
    subrepo: rewrite handling of subrepo state at commit (issue2403)
    templates/filters: extracting the user portion of an email address (BC)
    transplant: do not rollback on patching error (issue3379)
    update: fix case-collision with a clean wd and no --clean
    update: make --check abort with dirty subrepos
    update: use normal update path with --check (issue2450)
    wireprotocol: use visibleheads as reference while unbundling (issue 3303)