Adding some machinery to add bondeds from .tdb.

Drude FF needs special exclusions, Thole, and anisotropy for
terminal patches.  This commit introduces code to read and use
that information.  It doesn't work 100% correctly yet due to some
issues with combining rtp and hacks.  To be continued...

Change-Id: I763d0851f2a9bd464e68c23063f0780a2cb14f9d