PHYS-17 #time 3h 30m #comment -The decision of which method of forceCalculation to use now more properly resides in the Interactions file. Also defined some useful static constants here.  -Took int parameter out of Quadrant.getShapesRecurisve -Got rid of global "physicalObjects" shapeList. A few other changes to more fully utilize my classes rather than basic containers. Passing a few parameters by reference rather than value