Task #3577: Commenting and documenting of the calibrator pipeline and used recipes

...ocs/sphinx/source/developer/lofarpipe/support/utility.rst

...s/sphinx/source/developer/lofarpipe/tests/ingredients.rst

...ipeline/docs/sphinx/source/pipelines/sip/recipes/dppp.rst

...nx/source/pipelines/sip/recipes/gainoutliercorrection.rst

...docs/sphinx/source/pipelines/sip/recipes/get_metadata.rst

...peline/docs/sphinx/source/pipelines/sip/recipes/index.rst

...line/docs/sphinx/source/pipelines/sip/recipes/new_bbs.rst

.../docs/sphinx/source/pipelines/sip/recipes/setupparmdb.rst

...ocs/sphinx/source/pipelines/sip/recipes/setupsourcedb.rst

...ine/docs/sphinx/source/pipelines/sip/recipes/vdsmaker.rst

...ne/docs/sphinx/source/pipelines/sip/recipes/vdsreader.rst

CEP/Pipeline/recipes/sip/bin/msss_calibrator_pipeline.py

CEP/Pipeline/recipes/sip/bin/msss_imager_pipeline.py

CEP/Pipeline/recipes/sip/master/dppp.py

CEP/Pipeline/recipes/sip/master/gainoutliercorrection.py

CEP/Pipeline/recipes/sip/master/get_metadata.py

CEP/Pipeline/recipes/sip/master/imager_prepare.py

CEP/Pipeline/recipes/sip/master/new_bbs.py

CEP/Pipeline/recipes/sip/master/setupparmdb.py

CEP/Pipeline/recipes/sip/master/setupsourcedb.py