Log Message:
Update to 2.9.1:

This is a regularly-scheduled bugfix release.

    coal: hgweb style adds extra blank line in file view (issue4136)
    hg.openpath: use url.islocal to tell if the path is local (issue3624)
    hgweb: hack around mimetypes encoding thinko (issue4160)
    hooks: only disable/re-enable demandimport when it's already enabled
    merge: add "other" file node in the merge state file
    merge: audit the right destination file when merging with dir rename
    merge: don't overwrite file untracked after remove, abort with 'untracked files'
    merge: record the "other" node in merge state
    pathencode: eliminate signed integer warnings
    pull: close peer repo on completion (issue2491) (issue2797)
    purge: avoid duplicate output for --print (issue4092)
    rebase: do not try to reactivate deleted divergent bookmark
    resolve: use "other" changeset from merge state (issue4163)
    verify: do not prevent verify repository containing hidden changesets