xarray-5.9

XArray updates for 5.9

 - Fix the test suite after introduction of the local_lock
 - Fix a bug in the IDA spotted by Coverity
 - Change the API that allows the workingset code to delete a node
 - Fix xas_reload() when dealing with entries that occupy multiple indices
 - Add a few more tests to the test suite
 - Fix an unsigned int being shifted into an unsigned long
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