[giac] changes for PointList and Psi/polygamma simplification

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24591 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
scrollbar removed

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24592 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e