Deleting a sheet did not delete table parts and relations. Deleting a table needs...

Deleting a sheet did not delete table parts and relations.  Deleting a table needs to also delete any queryTable relations and parts.

Previous behavior didn't result in documents Excel complained about, but left dead entries in the ZIP structure, which made it bigger and bugged me.

This change does not attempt to delete query connection definitions, as those aren't referenced as relations, and don't have a usage counter to ensure we only delete them if there are no other references.  In my samples I had query tables on multiple sheets using the same connection definition, and wanted to delete only one sheet/table but leave others.

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1803317 13f79535-47bb-0310-9956-ffa450edef68