Flowpath OFE to Field database schema is inadequate for fields crossing HUC12s

[akrherz]

Presently, the database join for the flowpath_ofes to fields relations is based on the (fbndid) field along with an annoying further join between flowpaths and fields on the (huc12, scenario) fields. I really want to get de-duplication running on my end before ACPF comes up with something more robust. So this schema is not going to suffice.

• flowpath_ofes should use a foreign key to fields(field_id)
• fbndid should be dropped from flowpath_ofes
• The huc12 value in fields is super handy, but needs to go away as the value will not be unique to the field. This field is necessary to keep the import straight.

[akrherz]

Presently, Forest DEP OFEs do not have associated fields. As a temporary hack, I added huc12 geom fields for each so that we have no orphans.