pipeline

Pull request #1453: PIPE-2366: remove the dependency of the casa6/casarecipes package

Merge in PIPE/pipeline from PIPE-2366-remove-the-dependency-of-the-casa6-casarecipes-module-in to main

* commit '26f2b1d9c1288bb41ace1ff081426c4c1b6e0bfa':
  PIPE-2366: add docstring to almahelpers.py for improved code documentation.
  PIPE-2366: use the `tsysspwmap` helper function from a copy of `almahelpers.py` in pipeline/extern.
  PIPE-2366: use the right argument from the Pipeline version of `tsysspwmap`.
  PIPE-2366: use the tsysspwmap helper function from the Pipeline codebase instead of casarecipes.almahelpers.