Nonvirtual member functions

• float *create_patch_storage(int) - allocates internal storage to store data for the given number of patches. The number of patches is stored internally as well. Returns a pointer to the newly-allocated array.
• void init(void) - after all the data has been placed into a new Timestep instance, this routine calculate the max/min values for all the quantities, and anything else required based on atom coordinates, etc. Used for scaling and translating purposes.