[jdom-interest] XMLOutputter patch

[Alex Rosen]

I did a little profiling today. Using Dennis' benchmark, I was able to speed
up XMLOutputter by 20% by using a BufferedWriter. Yes, you have to buffer
both the writer and the stream for the best performance.

I got another 15-20% speedup by optimizing escapeAttributeEntities() and
escapeElementEntities() for the common case where no escaping is actually
necessary. When it is necessary, the new code should be about as fast, I
think.

Alex Rosen
SilverStream Software
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