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CylindricalGravity

v32	v33
99	99	=== Poisson Matrix Set Box Values routine ===
100	100
101		This routine is responsible for making changes to the stencil coefficients~~, for say, ghost zones, or differing geometry. This is where the mods to the stencil for 2.5D geometry will take place~~.
	101	This routine is responsible for making changes to the stencil coefficients. Originally it was written to fix coefficients for boundary/ghost zones. This makes it a natural place to modify coefficients for differing geometry as well; this is where the fixes for 2.5D gravity will go.
102	102
103	103	Since stencil values is a module wide variable, we should not modify it itself in any routine. Instead, we define a new array, tempStencilValues, set it = !StencilValues, and then modify elements of this new array when necessary.