Stranded vs unstranded in getReferenceRegions() for features

[devin-petersohn]

Here we call ReferenceRegion.unstranded(), losing the strandedness information.

There are known issues using this in the joins when trying to join datatypes that have no stranded information from the start.

[fnothaft]

This appears to be out of date; I believe this is closed. We'll reopen if necessary later.