Modify FITS and NXTomo load/save algorithms for new files

[mantid-builder]

Original Reporter: John Hill

Make some changes to the two algorithms to work with the new files released which include rotational information.

This is an interim change as further work is still to be done in these areas once the FITS structure is finalised.

Testing:

• Try to load all attached example files at once (select the two .fits and single .txt file together in load dialogue).

• Save the created workspace with SaveNXTomo algorithm

• Open the saved file in DAWN or HDFView and look for entry1->tomo_entry->data->rotation_angle - this should have the rotation values 0 and 4.5

[mantid-builder]

This issue was originally trac ticket 10397

[mantid-builder]

http://trac.mantidproject.org/mantid/raw-attachment/ticket/10397/data000.fits
(uploaded by John Hill on 2014-10-23T13:33:32)

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http://trac.mantidproject.org/mantid/raw-attachment/ticket/10397/data001.fits
(uploaded by John Hill on 2014-10-23T13:33:40)

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http://trac.mantidproject.org/mantid/raw-attachment/ticket/10397/Image_TomoAngles.txt
(uploaded by John Hill on 2014-10-23T13:33:47)

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