[antlr-interest] cleaned up sets (I hope)

[Terence Parr]

Hi,

I've worked really hard to clean up the way sets are implemented in  
ANTLR v3.  It was a major pain in the ass cleaning this up.  I added  
about 25 new unit tests and it passes all my examples-v3 stuff.   
Seems to do the right now.  The implementation is much better.  Will  
be much easier to maintain.

Please grab the build and try it.

http://www.antlr.org/download/build/antlr-03-29-2007.19.tar.gz

Should have the necessary libs in antlr-03-29-2007.19/lib:

	antlr-03-29-2007.19.jar, stringtemplate-3.0.jar, antlr-2.7.7.jar

Ter