Have GMM services return PGV if available
Currently services for GMvR and GMvM can return PGV values.
In Response Spectrum app, PGA is encoded as 0.001 SA, which is awkward.
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Update spectra service dataobject to be"PGA": value, "PGV": null, "SA": { "xvalues": [ ...], ... -
Update nshmp-appsfor new response structure (see nshmp-apps#169 (closed))
See also #62