Feature cloud improvements

Merged Mark OLESEN requested to merge feature-cloud-improvements into develop

The main impact of the changes are the addition of nParcels() as a base-level virtual in cloud, which enables quick querying of any derived cloud without the hassle of attempting to cast the regIOobject into any particular Cloud<ParticleType> type. Similarly, the zero-initialized constructors make it much easier to generate any particle type before filling out with more details and adding to a cloud.

Edited by Mark OLESEN

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