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FEATURE: Parcel model results depend strongly on dz #765

@claresinger

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@claresinger

We changed the parcel settings to run in dz not dt (for ease when running with many different w). When we did this, we noticed unexpected behavior, where the result of the equilibrium supersaturation reached for the parcel strongly depends on the dz used even when it is very small (1 m) where we don't think the piecewise constant pressure approximation should lead to any errors.

Minimal example to produce bug on this branch: https://github.com/claresinger/PySDM-examples/tree/ss_eq_error

fig 2 from Lowe example with dz=0.1 m
fig2ab_dz=0 1
fig 2 from Lowe example with dz=1 m
fig2ab_dz=1

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