Log Message:
Update to 1.12.0:

Herzi:
	* Allow multiple calls to gsf_xml_out_add_cstr.  [#167166]

Ivan:
	* Fix codepage problem.  [#162841]

Jody:
	* Support GObject properties in GsfOutfile::new_child
	* Cleanup the OLE2 property import
	* Re-org the GsfDocMetadata interface
	* Cleanup the OLE2 property export

Manuel Mausz:
	* OLE2 property export.

Morten:
	* Attempt to get non-ASCII filenames right on Win32.  [#171145]
	* Add "raw" properties to GsfInputGzip and GsfOutputGzip to
	  allow header/trailer-less files.  Also allow g_object_new
	  construction of these classes.
	* Add "uncompressed_size" property to GsfInputGzip allowing to
	  decompress files larger than 4GB.
	* Propagate errors from GsfOutputGzip's sink to itself.
	* Fix GsfOutputStdio to avoid killing the target file when we
	  get an error.
	* Add new GsfOutputCsv and GsfOutputIconv.
	* Fix GsfOutfileZip's handling of compression levels.
	* Allow getting the compression level when reading zip files.
	* Improve zip file performance.  (No longer reopens the underlying
	  file for each member you read.)
	* Clean up zip output for zip files with non-ASCII members.
	* Make it possible to use g_object_new to create zip io objects.