Change fdp to use sep attribute; change repulsive force to take into account how sparse the graph is; unify all uses of node width and height using macros.
Change fdp to use sep attribute; change repulsive force to take into account
how sparse the graph is; unify all uses of node width and height using macros.

jho1965us/graphviz,BMJHayward/graphviz,kbrock/graphviz,tkelman/graphviz,jho1965us/graphviz,pixelglow/graphviz,jho1965us/graphviz,ellson/graphviz,MjAbuz/graphviz,tkelman/graphviz,ellson/graphviz,kbrock/graphviz,BMJHayward/graphviz,ellson/graphviz,BMJHayward/graphviz,BMJHayward/graphviz,kbrock/graphviz,MjAbuz/graphviz,tkelman/graphviz,MjAbuz/graphviz,pixelglow/graphviz,ellson/graphviz,jho1965us/graphviz,pixelglow/graphviz,BMJHayward/graphviz,tkelman/graphviz,tkelman/graphviz,jho1965us/graphviz,kbrock/graphviz,ellson/graphviz,kbrock/graphviz,MjAbuz/graphviz,kbrock/graphviz,BMJHayward/graphviz,kbrock/graphviz,ellson/graphviz,pixelglow/graphviz,MjAbuz/graphviz,MjAbuz/graphviz,kbrock/graphviz,BMJHayward/graphviz,BMJHayward/graphviz,tkelman/graphviz,jho1965us/graphviz,ellson/graphviz,pixelglow/graphviz,tkelman/graphviz,pixelglow/graphviz,jho1965us/graphviz,ellson/graphviz,tkelman/graphviz,MjAbuz/graphviz,pixelglow/graphviz,tkelman/graphviz,jho1965us/graphviz,jho1965us/graphviz,jho1965us/graphviz,MjAbuz/graphviz,MjAbuz/graphviz,pixelglow/graphviz,tkelman/graphviz,tkelman/graphviz,BMJHayward/graphviz,pixelglow/graphviz,ellson/graphviz,ellson/graphviz,BMJHayward/graphviz,kbrock/graphviz,ellson/graphviz,MjAbuz/graphviz,pixelglow/graphviz,BMJHayward/graphviz,MjAbuz/graphviz,kbrock/graphviz,jho1965us/graphviz,kbrock/graphviz,pixelglow/graphviz