color & radio classes

[Shai Ayal]

I attach a test DLD function whihc implements radio & color properties
based on John's sugestions. The color property can also have an
optional radio component (i.e. it can be a valid colorspec or a radio
value). it compiles with mkoctfile.

Questions:
1) error in constructor: test case dd3 emmits an error but neverthless
accepts the invalid color -- should I just fallback to a default color
in this case?
2) naming conventsions: I named color_values to be similar to
radio_values although the correct name should be color_value since it
holds just one value. Is this OK or confusing?
3) general c++ question: what is the "color_property::operator
octave_value (void) const" operator, and how do I use it?

Comments are welcome

Shai

test_prop.cc
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