bug in bulk_inserts_wfs in FWS 1.6.7, 1.6.8

Hi all,

A bug was uncovered in FWS 1.6.7 and 1.6.8 that caused the “bulk_insert_wfs” to insert FireWorks with negative FW ids.

If you have one of those versions installed, please either upgrade to FWS 1.6.9 where the issue is fixed or avoid usage of the “bulk_insert_wfs” function.