Log Message:
Update to 1.2.22. From the changelog:

documentation:

* Stop maintaining ChangeLog files.  They make merging patches harder, and stop
  'git cherry-pick' from working as it should.  The git repo history should be
  sufficient for complying with GPLv2 2(a).

* Clarify help text for omindex --mime-type option.

* docs/omegascript.rst:

  + Fix documentation of $last to say it's the MSet index *one beyond* the end
    of the current page.  Reported by Andrew Chilton.

  + Clarify that $split and $substr work in bytes.  Previously we said
    "characters" which could be taken as meaning they work with UTF-8
    characters.

  + Update documentation for $filters - it was missing these CGI parameters
    from the list of those serialised: COLLAPSE, DOCIDORDER, SORT, SORTREVERSE,
    SORTAFTER

  + Explicitly note user can use $setmap to create their own maps.

* docs/overview.rst:

  + SVG extraction is built-in too.

  + Expand paragraph about command `false`.  Note the versions where explicit
    support was added, and that this will also work with any version on Unix,
    where `false` is a command.

  + Document `cdb_dir`.

* docs/cgiparams.rst: Document behaviour if xDB is not set.

* Change "characters" to "bytes" in a few places to clarify \ 
that we don't mean
  Unicode code points.

indexers:

* omindex:

  + Add '--title-size' option.

  + Handle .oft the same way as .msg - it's some sort of template email, and
    has essentially the same format.

omega:

* Make $querydescription ensure the match has been run, so that it includes
  filters.

* Avoid $allterms, $cgilist, $filterterms and $terms being O(n²) in the number
  of items in the returned list.

* If xFILTERS is not set, don't force the first page as that's unhelpful if
  someone fails to set it in their template.

* When environment variable SERVER_PROTOCOL is set to INCLUDED (as it is when
  we're being included in a page), we already suppress the HTTP headers, but
  now we suppress the blank line after the header too.

* Support option flag_cjk_ngram if built against xapian-core >= 1.2.22.

testsuite:

* Add test coverage for parsing of HTML entities.

build system:

* Fix error reporting if PCRE isn't installed. Fixes #693, reported by lhz7370.

portability:

* Avoid warning when building with glibc >= 2.21.

* Don't provide our own implementation of sleep() under __WIN32__ if there
  already is one - mingw provides one, and in some situations it seems to clash
  with ours.  Reported to xapian-discuss by John Alveris.

* Stop trying to use O_STREAMING - the patch to implement it was never merged
  into the Linux kernel, and I can't find any evidence that other platforms
  implement it.  The constant value O_STREAMING used now seems to be used for
  the part of O_SYNC which isn't covered by O_DSYNC, which seems likely to hurt
  performance if anything.