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Adds the power spectrum,
A_s, andalpha_sto the metadata module. Also adds a single small sim.Most of the power spectra are actually the same (
c000_ph000), so we can de-dup the data on disk by having all the astropy tables use the same underlying columns (this is done incompress.py). The resulting ASDF files have separate entries for each astropy table in the tree, but thesourcetag for the columns (i.e. the corresponding binary block) is the same.The metadata file is 9 MB, which is probably okay. We could tune this a bit more if astropy/asdf-astropy#156 gets implemented.
We now use msgpack on the params instead of pickle. The compression of json, pickle, and msgpack is the same, but msgpack is portable and supports non-string dict keys.
Closes #61.