Overview of changes between pymathml 0.2 and 0.3
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- Add support for <mspace>


Overview of changes between pymathml 0.1 and 0.2
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- Support some more entities;
- Add support for <mfenced>;
- New SAX based parser;
- Revamped sub/superscript layout algorithm;
- Miscellaneous fixes for better MathML compliance;
- Fix a potential infinite loop in vertical operator stretching code.
