English stemmer

Hi,

first thanks for your work.

I recognized a systematic weakness in your English stemmer. It does not 
reduce superlatives. For example "greatest" and "brightest" just remain 
unchanged.

Unfortunately just stupiditly removing "est" does probably not work that 
well. Grammatically this does not make sense for "test", "guest", 
"zest", Yet they might be no clashes with other stems...

Regards,
Peter

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