not loading the mock backend when tests are executed with SWT

* so we use only SWT and not load the other backends
* "cheating" tests that stub the backend to mock also get out of
  the picture
* extracted a code coverage file, so this file can always be
  loaded first as it needs to be the very first for good
  code coverage
Merge branch 'master' into BackendConfiguration
Stubbing out the opening of dialog windows for SWT specs
no more reference to the Mock Backend in the oval spec
Merge pull request #351 from PragTob/BackendConfiguration

Do not load the mocking backend when executing SWT specs
Merge branch 'master' into fi/built_in_methods