#4801 missings

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37962 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
improvement for Extremum/Root[] for If[0<x<10,f]

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37963 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
tidying

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37964 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#4801 Serif fix

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37965 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e