KWSys 2016-03-31 (3392da1d)

Code extracted from:

    http://public.kitware.com/KWSys.git

at commit 3392da1df3c363d6d1a80fa3f0e49fbd45c9dcf7 (master).

Upstream Shortlog
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Ben Boeckel (2):
      f6867bb7 SystemTools: flip junction deletion around
      3392da1d SystemTools: add buffer around preproc conditions