Hi Juan,

1. about optimising Cython code in skimage: how do I compile with -a? Because of local imports and so on, calling it on the source file directly is not an option, and I haven't figured out an obvious place to make it spit out the html otherwise…

cython -a does not depend on any imports. At least on my system it works for all files, regardless of imports… ?

2. about running tests: how do I easily figure out which tests were skipped when running "make test" and why they were skipped?

Since make test just invokes nosetests, you could simply use nosetests --no-skip.