Bug#917353: [python3-skimage] Cannot import skimage with new numpy

[Ole Streicher]

Package: python3-skimage
Version: 0.14.1-2
Severity: serious
Affects: python3-ccdproc, python3-hipspy, python3-sunpy
Tags: patch
Control: forwarded -1 https://github.com/scikit-image/scikit-image/issues/3551

$ python3
Python 3.7.2rc1 (default, Dec 12 2018, 06:25:49) 
[GCC 8.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import skimage
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3/dist-packages/skimage/__init__.py", line 167, in <module>
    from .util.dtype import (img_as_float32,
  File "/usr/lib/python3/dist-packages/skimage/util/__init__.py", line 8, in <module>
    from .arraycrop import crop
  File "/usr/lib/python3/dist-packages/skimage/util/arraycrop.py", line 8, in <module>
    from numpy.lib.arraypad import _validate_lengths
ImportError: cannot import name '_validate_lengths' from 'numpy.lib.arraypad' (/usr/lib/python3/dist-packages/numpy/lib/arraypad.py)

This happens in the CI tests on a number of packages after the update of numpy (see "Affects").

Since `_validate_lengths` is an internal identifies by Python convention, the bug is clearly in skimage.

It is resolved in 

https://github.com/scikit-image/scikit-image/pull/3556

For convenience, a patch is attached.

Cheers

Ole
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