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closes #13
changed syntax so the LogStream class is not actually a stream, but uses operator<< to log.
momentary log levels switch logging on and off and serve as a stand-in for line breaks.
added a unit test that will verify that the right log level combinations cause the right reaction (maybe that one should get explicitly written down for clarity, though...)
closes #31
DOCTEST_INCLUDE_DIR is being evaluated now. if it is empty, BUILD_TESTING won't be set, also, BUILD_TESTING can be configured to be OFF. If it is, the test code is not included anywhere, and the test project configs are not generated.