Add a few paragraphs to B-tree README explaining L&Y algorithm.
Heikki Linnakangas <heikki.linnakangas@iki.fi>
Add a few paragraphs to B-tree README explaining L&Y algorithm. This gives an overview of what Lehman & Yao's paper is all about, so that you can understand the rest of the README without having to read the paper. Per discussion with Peter Geoghegan and others.
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