Add function to generate stamps from RA, dec

[jeremykubica]

Adds a function make_stamps_from_emphems() that will be useful for debugging, precovery, and followup. In the process I saw a bunch of small cleanups:

• Moves load_deccam_layered_image() into new util_functions.py and deletes file_utils.py.
• Moves mjd_to_day() into new util_functions.py and deletes visualization_utils.py.
• Add a get_work_unit() helper function to FakeData.
• Remove a few more unused to/from YAML functions.
• Adds tests to some previously untested functions.

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