Add `biospecimen_site` or other field designation for autopsy sample locations

[jharenza]

What data file(s) does this issue pertain to?

histologies-base.tsv and histologies.tsv

What release are you using?

v15

Put your question or report your issue here.

We have some not fully harmonized information from the BCRU about tissue locations for the autopsy samples, and should note this in the histologies file in some way. Right now, all aliquots for an event have the same match_id, but really should not since they are coming from different regions. This is still a harmonization in progress, so TBD when this will be integrated.