Minor errata

[ceb8]

Issue to capture small non-urgent things that I notice while adding new functionality:

cube_cut.py

• [x] _get_cutout_limits docstring parameters is wrong (center_coord is no longer a param)

• [x] target_pixel_file = os.path.join(output_path, tpf_name) is indented one too far

• [ ] Get rid of the overwrite=True or make it an argument in cube_cut?

• [ ] Make cube_cut handle x vs y consistent with new fits_cut functionality (which is correct)

• [ ] Update file creation date to reflect cutout date not cube date

Tests

• [ ] Remove unused extname argument in add_keywords

General

• [ ] Make a utils file and move common functionality there
• [ ] Update docs to include info on how to cite
• [ ] Refactor cube_cut/make_cube into one file?