great Cairo library. Its goals are:
* Lightweight
* Simple to use
* Nice looking with default values
* Customization
It won't try to draw any possible chart on earth but draw the most
common ones nicely.
WWW: http://bitbucket.org/lgs/pycha/wiki/Home
PR: ports/136597
Submitted by: Wen Heping <wenheping at gmail.com>
