0.4.3-1

Higher level operators, such as chamfer and fillet, can now be used
in the path definition. They do not work yet for Bézier curves but
the infrastructure is in place.

A Gtk+ widget for easily showing the canvas has been implemented. It
is based on GtkDrawingArea and provides some interaction throught the
mouse, such as zooming and panning. It is not viable for serious work
but it is funny to use and opened to improvements.

The CPML library has been enriched with the missing functions
needed by the above new features. Now it has a ..._length() and
..._near_pos() families of functions. The mathematic behind this
library is far from complete: the overall design is quite stable
but there are a lot of placeholders, especially when curves were
involved.
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