diffcore-delta: stop using deltifier for packing.
diffcore-delta: stop using deltifier for packing.

This switches the change estimation logic used by break, rename
and copy detection from delta packing code to a more line
oriented one.  This way, thee performance-density tradeoff by
delta packing code can be made without worrying about breaking
the rename detection.

Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git