pytest migration: use pytest test skipping instead of nose's While the nose test skipping still worked, we want to remove all remnants of nose, so switch to the pytest equivalent. Note: due to a bug in pytest-sugar (reported at [1]) the skipped tests are not shown explicitly when using the 'skipif' approach, while they were with the nose approach. Since pytest-sugar is not enabled yet in setup.py, this is not deemed a problem. [1] https://github.com/Frozenball/pytest-sugar/issues/75

syntax: glob
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syntax: regexp
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