[giac] load DLLs from jars (for testing), handle arbitrary constants/integers

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25331 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
4.9.127.0

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25332 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e