KWSys 2013-08-06 (deec6b8a)

Extract upstream KWSys using the following shell commands.

$ git archive --prefix=upstream-kwsys/ deec6b8a | tar x
$ git shortlog --no-merges --abbrev=8 --format='%h %s' beef6819..deec6b8a
Brad King (1):
      e39f85e0 SystemTools: Activate EnableMSVCDebugHook under CTest

Burlen Loring (1):
      1d882d4c SystemInformation : Better stack trace

Patrick Gansterer (2):
      89e42c36 SystemTools: Remove duplicate code for parsing Windows registry keys
      deec6b8a SystemTools: Add a function to get subkeys of a Windows registry key

Sean McBride (1):
      4c4f8a9e Supress clang warnings about dynamic exception specifications

Change-Id: I37367dc5db58818d5954735e00c6d523a1dd1411