Large regexes are poorly handled

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Figure out how to handle very large regexes--the strategy we're using generates very large class files.

a04107b097ff559542c4e9c2bcd937eed93145dd substantially increased the size of generated regexes, making the problem worse, and required commenting out a previously used test case.

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The problem isn't gone, but some recent work to enable use of byteclasses is probably helpful. The regex Holmes.{0,25}Watson|Watson.{0,25}Holmes now generates a 340 KB class, instead of 2MB.

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Subsequent updates to encoding make Holmes.{0,25}Watson|Watson.{0,25}Holmes only 245181 bytes.