TODO revision 6498 
1The PLY to-do list:
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31. Finish writing the C Preprocessor module.  Started in the
4   file ply/cpp.py
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62. Create and document libraries of useful tokens.
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83. Expand the examples/yply tool that parses bison/yacc
9   files.
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114. Think of various diabolical things to do with the
12   new yacc internals.  For example, it is now possible
13   to specify grammrs using completely different schemes
14   than the reflection approach used by PLY.
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