[giac] #3274 make sure f(x):=x+x, {x+x,y+y}, x+x=y+y are simplified

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25856 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
XSD update

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25857 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Wrong capitalization of list type

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25858 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Make sure helper for TriangularCurve is not written in XML

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25859 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e