2397 fits support

[JackEAllen]

Issue

Closes #2397

Description

Add support for FITS files to CLI --path optional argument and drag and drop functionality by including fits as a filetype to be searched in mantidimaging/core/io/utility.find_first_file_that_is_possibly_a_sample.

Upon adding FITS file support to find_first_file_that_is_possibly_a_sample(), a new warning appeared in DEBUG mode stating that the file loaded by mantidimaging/core/io/loader/loader._fitsread was not correctly closed after opening. _fitsread has been refactored so that it now correctly closes the image after reading.

Testing

• Verified unit tests pass
• Manually tested dragging and dropping a FITS dataset into MI.
• Manually tested loading a FITS dataset using CLI --path argument.

Acceptance Criteria

Before testing, If you rename the folders associated with the FITS dataset you plan to use for testing to match a strict tiff dataset (i.e. sample>Tomo, open>flat_before, dark>dark_before and so on), drag and drop should identify all relevant files and add to loading dialog menu or load in as part of CLI --path operation.

• Verify unit tests pass
• In debug mode, verifying no warnings about files not being closed returned:
  • Check if you can drag and drop a fit and fits dataset into mantid imaging and that it is correctly identified as a valid dataset and loaded into loading dialog and then correctly into MI (Spectrum Viewer is the best place to check this)
  • Check that you can load fit and fits data into MI using the CLI argument --path (Spectrum Viewer is the best place to check this).
• Check that tif and tiff files can still be loaded via drag and drop and also via --path CLI argument.

Documentation

docs/release_notes/next/fix-2397-fix-fits_file_support

[coveralls]

coverage: 73.672% (+0.004%) from 73.668%
when pulling 6ae0879 on 2397-FITS_Support
into a5ee3dc on main.

[ashleymeigh2]

Changes look great! The addition of FITS file support is well implemented, and the refactor ensures proper file handling.

[ashleymeigh2]

Changes look great! The addition of FITS file support is well implemented, and the refactor ensures proper file handling.