Fix failures when converting test MSs from casatestdata

[FedeMPouzols]

Fixes #196.

This catches up with a number of failures that have been creeping in throughout the last few days/weeks. See issue for a description of the various failures. Perhaps the most general one was with MSs produced by the CASA simulator (which writes arrays with dimensions transposed wrt standard), but there were a range of diverse subtle issues.

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This contribution is made under the current ALMA software agreements.
(c) European Southern Observatory, 2024
Copyright by ESO (in the framework of the ALMA collaboration)

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