scikit-image==0.14.3 crashes when installed on Mac

[csala]

scikit-image version 0.14.3 has a problem that prevents it from being installed on Mac OSx: scikit-image/scikit-image#3972

We should add !=0.14.3 to the version specification to allow installing either a later or an earlier version (all of them work), but prevent this one from being installed.

Also see if 0.15 is fully compatible to extend the version range up to 0.16.