Log Message:
Update to 1.7.3:

1.7.3:

    * archive: don't set gzip filename header when there's no filename
    * checknlink: use two testfiles (issue2543)
    * churn: ignore trailing and leading spaces (issue2546)
    * date: fix matching of underspecified date ranges
    * eol: improve help on whether EOLs are changed in working copy or repository
    * fncachestore: copy dh directory before the manifest
    * hgweb: abort if config file isn't found
    * hook: assume relative path to hook is given from repo root
    * hook: fix import path handling for repo=None
    * https: use web.cacerts configuration from local repo to validate remote repo
    * https: warn when server certificate isn't verified
    * keyword: copy: when copied source is a symlink, follow it
    * patch: write .rej files without rewriting EOLs
    * strip: typo bugfix related to '--nobackup -> --no-backup' rename (issue2377)
    * tag: abort if not at a branch head (issue2552)
    * tag: don't check .hgtags status if --local passed
    * tag: fix uncommitted merge check and error message (issue2542)
    * util: fix ellipsis() not to break multi-byte sequence (issue2564)
    * util: work around behavior change in Python 2.7.1
    * windows.rename: eliminate temp name race (issue2571)
    * wix: add an ssl certificate file to the WiX installers