Create the periodic system using normal FMM functions for all kernels, add unit test for all 3 kernels, be aware that current particles are randomly generated and not real system for periodic simulations

Rotation Kernel Oups in the name of rotation functions and add a particle to particle no mutual interaction in the kernel.

Finished the rotation kernel, BUT need to make an optimized one and remove computational tests. The current version is a copy of the papers formula

from child-cluster-interactions