Fixed issues with Thole for CB.

Thole factors for CB atoms are read from .rtp values in the case
of repeating entries (e.g. .tdb and .rtp) and the value from the
.rtp entry is maintained.  This allows us to alter Thole factors
properly when patching termini.

Change-Id: Ibd5420e1bd2971c480a6a1b3230e213a8f473246