mdiff: reinstate new algorithm
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mdiff: reinstate new algorithm
This unreverts the new algorithm with a fix from Chris (s/len/lena)
and adds some comments on what it's doing.
manifest hash: 75fc1acee1926e57d495f67a44cd88d9555f2356
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include hg
recursive-include mercurial *.py
include tkmerge
include hgweb.cgi
include hgeditor rewrite-log convert-repo
include tests/*
include *.txt
include templates/map templates/map-*[a-z]
include templates/*.tmpl
include doc/*
include README