-corrected whitespace problems and replaced tabs with spaces
-added cutoffDensity as a parameter for fluidForce, this allows for the
adjustment of where density is considered zero. In many cases there is
division by density which can result in extremely large values unless
this parameter is adjusted correctly.
-removed some unecessary declarations
-changed calcNormal to return a Vector as opposed to a magnitude. This
is still not implemented for surface tension calculations yet
-added a break to measureFluidSize() so we don't iterate through all
fluid particles unless we have to.
-code still needs more clarification on the fluidgraphics side. would
very much like to add viscosity to the createParticles dialog in future
revision (hopefully within a few days)

svn path=/branches/work/soc-step-fluids/step/; revision=1013486