add support for "color" property to <table> and <cell> to permit   overriding of inherited pencolor.
add support for "color" property to <table> and <cell> to permit
  overriding of inherited pencolor.

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