Changing giac.js to the latest version in web/kickstart.xml

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25562 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Tests for 4.2 commands

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25563 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
NPE fix for ShowAxes[2,true], ShowGrid[2,true]

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25564 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e