Revert "more efficient lines() with UU when not chomping"

This reverts commit b44651929729bc12d5740c8229bd333b2addc762.
more attempts at efficient lines_utf8
add lines benchmarking tests
optimize lines_raw and add comments for other optimization ideas
have harness use ../lib in @INC
add Dumbbench based benchmark scripts
modify tests for dumbharness
do less explicit unlocking to avoid copying return values
add touchpath method
bump Changes