Fixing #571. skip_install should override usedevelop #572
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From the discussion in #270 one realises the need of supporting both skip_install and usedevelop together, with skip_install having priority (usedevelop being considered as an install option).
This PR implements such change.
For the tests to run also in py27 it was necessary to fix using FileNotFoundError
Also, in centos7 virtualenv alwayscopy is broken, so for the moment it detects the platform and skips the test.
Fixes #571