BF: recythonize routines.pyx to fix import error
BF: recythonize routines.pyx to fix import error

We were getting `ValueError: level must be >= 0` errors on import; fix
by rebuilding c file with more up-to-date Cython.

alexis-roche/nireg,nipy/nireg,alexis-roche/nipy,alexis-roche/nipy,nipy/nireg,alexis-roche/nipy,alexis-roche/nireg,alexis-roche/nipy