Remove second list elements from first list

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34850 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
SolveQuartic improvements

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34851 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e