* fixed an assertion failure when importing a document in Excel 2003 XML format containing an autofilter with no filtering applied to it. * added a set of new interfaces to support importing pivot table definitions from xlsx documents. * added support for dumping the internal state of pivot caches and pivot table definitions as part of the debug state output. * added clarification on the return value of import_sheet::get_sheet_size() interface method in the documentation. * C++ API reference has been restructured to show each symbol in a separate page, and have their header information also included. * added test cases for testing expected string labels for enum types. * fixed orcus-json's map mode which would previously fail when built with CMake.