[giac] rand now accepts rational argument. Improve numerical checking in solve with trig functions.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26906 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Open without editing started

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26907 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@26908 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e