<h2>org.das2.qds.BundleDataSet</h2><p>create a higher rank dataset with dim 1 being a bundle dimension.  Each
 dataset must have the same length.

 Note this was created before BUNDLE_1 and bundle descriptor datasets were
 introduced, so this code is suspect.  TODO: review and ensure compatibility
 with updates to bundle dataset semantics.

 Copied from JoinDataSet in June 2009
 Modification History:<ul>
 <li> 2012-07-17: allow rank 2 datasets to be bundled.  TODO: really?  code doesn't look like it!
 <li> See https://sourceforge.net/p/autoplot/feature-requests/267/
 </ul></p>