Investigate array passing mechanisms and creation of array temporaries

[rouson]

This work is limited in scope to the most computationally intensive kernels and the new particle update algorithm.

Investigate timing differences between:

• [ ] Current practices (assumed shape)
• [ ] Assumed-shape arrays with contiguous and/or allocatable attributes for dummy arguments
• [ ] Deferred shape

Also, use:

• [ ] Runtime checks for array temporary creation

To document & check where the compiler is creating arrays temporaries.