[giac] idivis now sorts its output, fix for #3870
Code changes for ti nspire port, all sorting functions are now compatible with ustl and that should have positive effects on JS output
New eliminate code with revlex/revlex ordering for <=3/11, 7/7 or 11/3 variables/parameter that should enhance performances (not much tested yet...).

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33383 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Changing giac.js to the latest version in web/kickstart.xml

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33384 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e