dump functions for QM input files

[tovrstra]

We could use the input spec based on MOLSSI schema

[FarnazH]

@tovrstra, how is this different from issue #43?

[tovrstra]

#43 does not refer to the input spec from MOLSSI but I'm not sure how relevant this is?

[wilhadams]

@FarnazH I'll try to document the qcschema_input schema so that it's relatively simple to dump QM input file info to JSON

[PaulWAyers]

@wilhadams can you make sure that every field that exists in the IOData object exists at least as an optional field in JSON? That way we can use the JSON for long-term storage (though a pickle of the IOData object can still be useful for short-term storage).

(Hat-tip Toon)

[tovrstra]

closed in favour of #43.