Introduce manifest and update

@markhibberd Finally got the cli tests to pass. I started to delete _some_ of the factset `.version` stuff, but I've stopped just short of touching `FactsetGlob.select`, which meant it was easier to continue to write it out just for now. I think it deserves it's own PR (and I don't think I will have time this morning).

Going to do a sweep now, make sure everything is tested, and cleanup the commits a little.
Feels good to delete stuff from this package. :)