Update groonga to 1.2.6.

Release 1.2.6 - 2011/09/29
--------------------------

Improvements
^^^^^^^^^^^^

* Improved error message on type cast.
* Added geo point value validation on type cast.
* Supported :doc:`/tutorial/query_expansion`.
* Added `--query_expansion` option to
  :doc:`/commands/select` for query expansion.
* Added geometry conversion macro between degree and msec.
* Supported type cast in :doc:`/functions/geo_distance` ().
* Don't split tokens with full width space in command line. #986
* Supported conversion between TokyoGeoPoint and WGS84GeoPoint.
* Exported grn_geo_select_in_circle() and grn_geo_select_in_rectangle().
* Supported CentOS 6.
* Supported the current Debian GNU/Linux sid.
  Patch by SATOH Fumiyasu. GitHub#3

Fixes
^^^^^

* Fixed a bug that geo point is loaded as broken value.

Thanks
^^^^^^

* SATOH Fumiyasu

Release 1.2.5 - 2011/08/29
--------------------------

Improvements
^^^^^^^^^^^^

* Added experimental Windows installer support.
* Accepted "#" and "-" as a valid name characters. #1043
* Accepted all valid characters except "_" as the first character. #1043
* Supported `--each` for `[...]` form :doc:`/commands/load`. #1044
* Added documentation for :doc:`/suggest`.
* Supported threshold as `--frequency_threshold` and
  `--conditional_probability_threshold` options in all
  :doc:`/commands/suggest` types. #1042
* [groonga-suggest-httpd] Supported log reopen by SIGUSR1. #1048
* Supported string input for reference vector column value. #1051
* [groonga-suggest-httpd] Added `--n-lines-per-log-file`
  option that changes log line limitation for a file.
* [groonga-suggest-httpd] Added `p` parameter for
  `--conditional_probability_threshold`.
* Added GRN_CTX_PER_DB flag for grn_ctx_init() and grn_ctx_open(). #1053
* Exported grn_ctx_close(). #1035

Fixes
^^^^^

* Fixed a crash bug that invalid value is passed as match expression
  argument in :doc:`/commands/select`. #1047
* Fixed a bug that hash table cursor returns garbage records.

(obache)