Moving many functions from nbgui into ImageD11

[jadball]

Apologies for the monster commit! Key highlights below:

• New GrainSinogram class to handle building sinograms from a Grain and DataSet object.
• HDF5 load/save methods for Grain class
• Many useful helper functions in DataSet class (e.g getting peaks tables for you)
• Some utility functions inside iradon
• Lima segmenter now uses mask and background files from the dataset object if none are manually provided
• Utility function for blobcorrector.py to correct a columnfile with a spline

All the diffs should be readable aside from grain.py which I accidentally linted (sorry!) - look at the bottom of the file for new stuff added.

[jadball]

This seems to be failing due to a missing hdf5plugin on py 2.7 - @jonwright any ideas? I can push a new commit in this PR to fix if you know how

[jadball]

I think the problem is that dataset.py now imports properties.py which needs hdf5plugin for its IO functions. We are only just now seeing this issue on Python 2.7 because we have some tests in test_datasets.py that are now indirectly targeting code with HDF5 I/O

[jadball]

This may be solved by adding hdf5plugin as an explicit dependency to ImageD11?

[jonwright]

We should have hdf5plugin in setup.py already: 'hdf5plugin==1.4.1 ; python_version < "3" and sys_platform == "win32" ', 'hdf5plugin ; python_version >= "3" ',

[jonwright]

But I guess there is a bug there as it has nothing for python2 on non-windows...

[jonwright]

I will merge and attempt to fix the CI later, the problem is not related...