Automatic Assignment(Exercise)-checker first commit

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34744 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Automatic Assignment(Exercise)-checker first commit fix

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34747 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
remove Tangent[line, implicit poly] (not implemented) #4380

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34749 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e