SolarField added.
It allows to automaticaly assemmbly a solar field wiht Ns collector in series, and Np collettors row in parallel.

The Component MassFlowMultiplier is added, In order to avoid multiple calculation for the row in parallel (which are assumed to be simmetricaly in terms of mass flow and outlet temperature).
this component is basically a Cell1DimInc, with a "ficticional" moltiplication for the mass flow by Np