remove Wu_trace
vstack does not take a dtype
update naive_trace tests
remove useless guess_tests
docs
get_rgb does not interpolate endpoints
bresenham_colormapping works
docs
use corner_harris
add colormapping tests
 docs
remove unused CornerInterp
use test generators and ok_
move all KeyboardCrop stuff to quarantine
docs
Merge branch 'logscale'