moved unit test executables from src dir to tests/, new flag for cmake (wheter...

moved unit test executables from src dir to tests/, new flag for cmake (wheter to compile unit tests by default), added tests/ to .gitignore

git-svn-id: https://dng.biozentrum.unibas.ch/svn/openstructure/trunk@2281 5a81b35b-ba03-0410-adc8-b2c5c5119f08