message: Tweak carbon for darker color from Avo1
diff: @@ -153,11 +153,12 @@ double element_covalent[] = {
  unsigned char element_color[][3] = {
  // See, for example http://jmol.sourceforge.net/jscolors/index.en.html
  // Changes - H is not completely white to add contrast on light backgrounds
  + // - C is slightly darker (i.e. 50% gray - consistent with Avo1)
  // - F is bluer to add contrast with Cl (e.g. CFC compounds)
  // # Du # H # He
  { 17, 127, 178 }, { 240, 240, 240 }, { 217, 255, 255 }, { 204, 128, 255 },
  // # Be, B, C, N
  - { 194, 255, 0 }, { 255, 181, 181 }, { 144, 144, 144 }, { 48, 80, 255 },
  + { 194, 255, 0 }, { 255, 181, 181 }, { 127, 127, 127 }, { 48, 80, 255 },
  // # O, F, Ne, Na
  { 255, 13, 13 }, { 178, 255, 255 }, { 178, 227, 245 }, { 171, 91, 242 },
  // # Mg
  