Parallel:

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   Parallel connects two state space models. Both systems feed off of the same
   input and the outputs are the sum of the individual systems outputs.

   The resulting system is

   [a1  0] [b1] [c1 c2] d1+d2
   [ 0 a2] [b2]

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   Form: [a, b, c, d] = Parallel( a1, b1, c1, d1, a2, b2, c2, d2 )
-------------------------------------------------------------------------------

   ------
   Inputs
   ------
   a1                  Plant matrix
   b1                  Input matrix
   c1                  Measurement matrix
   d1                  Input feedthrough matrix
   a2                  Plant matrix
   b2                  Input matrix
   c2                  Measurement matrix
   d2                  Input feedthrough matrix

   -------
   Outputs
   -------
   a                   Plant matrix
   b                   Input matrix
   c                   Measurement matrix
   d                   Input feedthrough matrix

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Children:

Common: Control/SizeABCD