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Create MS concat step

Marcel Loose requested to merge RAP-222_script-to-concatenate-MS-files into master

Add a CWL step to concatenate multiple input Measurement Sets (as produced by LINC) into a single Measurement Set (as required as input for Rapthor).

A new script concat_ms.py was created, largely based on the existing concat_linc_files script. The reason for doing so is that the input MS's (produced by the fetch_data.cwl step) will not be stored in a single directory, which is required by concat_linc_files. The concat_linc_files script now re-uses the logic that was transferred to concat_ms.py in order to avoid code duplication; its API and behavior haven't changed.

Closes RAP-200 and RAP-222

Edited by Marcel Loose

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