Do not redefine geos in Touch if definition is the same

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27451 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Improved beforeTest, refactored several test cases concerning the CAS article (the test cases previously titled "Rubrik").

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27452 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e