adding color to figure

[Shai Ayal]

The following patch adds the color property to figures, I leave the
gnuplot implementation to someone more suitable than me. I will
implement it in the "new" backend.

Shai

2007-12-07  Shai Ayal  <shaiay at users.sourceforge.net>

        * graphics.h.in (class figure) add the color property
        graphics.cc (class figure) ditto
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