[PATCH] diffcore-pickaxe: switch to "counting" behaviour.

[PATCH] diffcore-pickaxe: switch to "counting" behaviour.

Instead of finding old/new pair that one side has and the
other side does not have the specified string, find old/new pair
that contains the specified string as a substring different
number of times.  This would still not catch a case where you
introduce two static variable declarations and remove two static
function definitions from a file with -S"static", but would make
it behave a bit more intuitively.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>