Changing javagiac.dll's to the latest version in desktop/kickstart.xml

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25869 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Don't name the helper variable a to avoid false positives in CAS tests

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25870 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] fix for Numeric[5a/3,3]

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25871 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e