resolves 2192: enable sws by default

[prudhomm]

• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes?
• Have you successfully run the Feel++ testsuite with your changes locally?
• Have you written Doxygen comments in your contribution ?

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• closes enable sws by default #2192

[prudhomm]

@vincentchabannes no need to update the branch, if you merge make sure that you use [ci skip] to avoid making a rebuild for this