Error when filled arc

[hilaire]

p filled raise an error:

| f  p |
f := DrGeoSketch new.
p := f arc: 1@0  to: 0@0 to: 0@1.
p filled.

The alternative does not work very well either:

| f  p |
f := DrGeoSketch new.
p := f arc: 1@0  to: 0@0 to: 0@1.
p style fill:true

because DrArcStyle>>fill: boolean needs to be removed in the Cuis port.

Then use the #finializeFilledCurve: in both arc method of DrGeoSketch so the user can directly send the #filled message to the arc reference in her code.