Threshold for hitting (points)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33500 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
YANPE

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33501 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e