[giac] changes for inter and equation

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26487 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@26488 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e