Fix third-party header file inclusions when building with nomlib

  This corrects several compile errors resulting when an outside
project -- i.e.: TTcards -- tries to link with nomlib's (public)
header files; third-party dependency header file paths leading to
json.h & rapidxml.hpp become unreachable within the context of the
installed copy of nomlib's OS X framework.

  This is considered a temporary patch, additional considerations
and clean up work is necessary; saId third-party header files
should *probably* be marked as private header files of nomlib, and
re-worked accordingly?
Fix Indentation-level