Generalize 1D and 2D data

[jhbakker]

Currently, 1D data is specifically x→q and y→Iq, but it need not be.
the data types should be made as general as possible, so that new 1D data formats can be added in more easily.
This is most directly applicable to SESANS integration, but also for future flexibility of Sasview.

[ricardo]

Xarray (​http://xarray.pydata.org/) being labelled arrays with metadata might be a viable option.
See example here: ​https://github.com/ricleal/PythonCode/blob/master/Xarray/Xarray%20tests.ipynb

[butler]

Jurrian says this is partly done but more work is required if this is to really be achieved. Moving this to 4.2 rather than closing at this point.