What's new in at-spi2-core 2.1.2:

* Fix atspi_table_get_caption|summary.

* Fix introspection for atspi_table_get_row_column_at_index.

* Copy match rule attributes, rather than just ref counting the hash, for
  compatibility with pygi.

* Rework atspi_accessible_set_cache_mask to make it usable.

* Fix a crash that might happen if a method call times out.

* Disable caching if atspi_event_main has not been called to run the main loop.

* Fix atspi_accessible_get_toolkit_version.

* Add atspi_accessible_get_atspi_version to fetch the version of the AT-SPI
  specification provided by an application.

* Cache application-wide toolkit name and version.

* Allow caching of attributes, but not enabling by default, as there is no
  event yet (BGO#649771).

* Make deferred_messages a GQueue rather than a GList for performance reasons.

* Fix accessibility bus breakage when a user runs an administrative app.