Fairly big overhaul since TKP code no longer depends on LOFAR pipeline package.

  - Make casatools (casacore/casarest/pyrap) a separate build, installed under
    the 'stable soft' dir.
  - Separate the LOFAR and TKP builds
  - Add separate scripts for building the RSM frozen version of the LOFAR
    pipeline.

New, simpler DEV mangling