Clean up Docker build

Marcel Looserequested to merge
cleanup-docker-build into master

Remove LOFARBeam and Dysco, and clean up.

  • Removed LOFARBeam and Dysco from the build:
    • LOFARBeam doesn't build against Casacore 3.6.1 and has been superseded by EveryBeam;
    • Dysco is nowadays part of Casacore, which we now build ourselves.
  • Cleaned up the Dockerfile:
    • grouped ARG statements near the top;
    • added -DTARGET_CPU argument to the cmake statement, for those packages that support it.

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