clean code

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34765 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
remove (GeoPoint) cast

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34766 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
better override

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34767 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Enable moving the second point when drawing lines etc

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34768 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e