Added merge to db doc. Renamed read db to just 'read' #58
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The database merge function was missing from the documentation, so it was added.
While in the routine, also tidied up some other docstrings.
One change to note: the db.read_img_info_from_db_file had a very clunky name. It was renamed to db.read. The old name still references the new fucntion and this works.