Rename IFOMap
IFOMap is a bit of an unclear name, and it shouldn't be capitalized (alongside the filename included here: !65 (merged))
It's an array of unique, abbreviated strings to refer to each IFO by (in a standard but arbitrary order), which we access with 'ifo_id'.
I'm used to "code" for that, but that's not really standard.
Plus, it doesn't Have to be abbreviated, and if we add similar structures for other IFO attributes, we'd Probably refer to this "code" as either "name" or "string".
Whereas the full name "Hanford" would be a "human_readable_string" or "human_readable_name"
ifo_strings
sounds like it could include combinations, so I'd go with
ifo_names