Information methods.
hex () simply gives a string on the #rrggbb
format. If n is given, the number of significant
digits is set to this number.
(Ie, n=3 gives #rrrgggbbb.)
name () is a simplified method;
if the color exists in the database, the name is returned,
per default is the hex () method use.
html () gives the HTML name of
the color, or the hex (2) if it isn't one
of the 16 HTML colors.