Added components (from casacore)


git-svn-id: https://svn.astron.nl/casarest/trunk/casarest@8761 4215e939-9a1b-0410-8a78-adf775e9a44f
TWEAK: synthesis/apps/lwimager.cc: allow wfhogbom operation
TWEAK: synthesis/MeasurementEquations/Imager.cc: hack in ASGARD frequency for spindex stuff