Tuple syntax for bins in CutMD

[OwenArnold]

This ticket is blocks : TRAC11354

Andrei is keen on this, and we have it in the design documentation https://github.com/mantidproject/documents/blob/master/Design/VATES/MantidHorace/syntax-proposal.md

In the mantid.simpleapi api only. We want to be able to provide P1Bins to P4Bins as a tuple of tuples. See above for example usage. The wrapper for the algorithm would then unpack the tuples and assign the input to the relevant property based on it's index.

We will look at making CutMD more flexible about slicing 3+ dimensions. At the moment we have P4Bins but no P5bins, but that's not in the scope of this work.

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Keywords: VATES

[OwenArnold]

This issue was originally trac ticket 11353