fix mlcape if parcel_start_pressure != bottom #3147
Merged
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If a user calls
mixed_layer_cape_cin
and provides aparcel_start_pressure
kwarg where the pressure provided is not the surface, then when the pressure of the mixed layer parcel gets appended to the pressure array, pressure is no longer monotonically decreasing. This raises an exception when computing the LCL.This PR trims out any area beneath the provided start pressure, since it isn't used in the CAPE/CIN calculation anyway, and this prevents the pressure from increasing-then-decreasing.