bdiff: tweaks for large files - adjust the common line threshold to .1% this speeds up a delta of 7M lines of source from 10m to 40s - adjust the scaling of the hash array down a bit as it was raising the peak memory usage significantly

changeset:   0:61c9426e69fe
tag:         tip
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     test

---- HEADERS
200 Script output follows
---- DATA
[('content-type', 'text/html; charset=ascii')]
---- ERRORS