Change nocopy to copy!
Let's fix how BooleanImage copies images

If you pass in np.bool data and say don't copy, then this will
be honoured. However, if you pass non-np.bool data, then we have
to make a copy, and then we raise a warning to tell you!
Update docs a bit
Raise a warning if we copy data in image

Also add some tests to check this
Formatting the asserts
Write new sanity tests!
Warnings raised in trimesh/pointcloud