Tests for "non-compliant" doxygen strings, e.g. use of
- "getter for..." instead of "returns the..."
- "setter for..." instead of "sets the..."
Will be expanded in future to also test for:
- "return ..." instead of "returns ..."
- "set ..." instead of "sets ..."
instead of adding an extra CMakeLists in .ci/travis/code_layout to build API doc, astyle and run tests (indentation, spelling, sip, doc coverage), the top CMakeLists has been adapted to allow not building core libraries and possibly just the static code layout
* astyle has been moved from /src/astyle to /lib/astyle (I would propose to move all external libraries, and possibly add git submodules)
