Enable nucleation

[jcurtis2]

Currently we have nucleation not able to be enabled. This problem will most likely change/disappear when PartMC is rewritten for compdyn/partmc#184.

However to fix the issue now, RunPartOpt will need access to AeroData to modify the number of weight classes (and subsequent tests will need to be fixed to include this input.).

[jcurtis2]

Support also probably needs to consider a longtime existing issue of what to do here: compdyn/partmc#65

PyPartMC only uses NUMMASS_SOURCE weighting (which is most efficient except in the case of nucleation enabled). This weight choice should be relaxed by passing additional details in the json input to RunPartOpt.

[github-actions]

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[github-actions]

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[github-actions]

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[github-actions]

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[slayoo]

compdyn/partmc#188