This is really just a bunch of ideas of things that could be done.
I'm not actively working on any of them.  <jce>

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- convert to SWIG, 
	generate parallel tcl, python, perl extensions from the same sources

- add support for output of PNG binary to memory Tcl_Obj (code from GD.pm?)

- complete support for HTML4.0 entities like "&amp;"

- allow doubles for coordinates and round internally to ints to improve
	compatability with canvas

- add polyline generation

- add bezier line generation

- add support for named colors
