Changed the z axis to point out again, i.e. changed the sign in gx, gxz, gyz.
Changed the z axis to point out again, i.e. changed the sign in gx, gxz, gyz.

--HG--
extra : convert_revision : svn%3A0beaa508-17e7-11de-9433-ad2e3fad96c5/trunk%4050

leouieda/tesseroids-original,leouieda/tesseroids-original,leouieda/tesseroids-original,leouieda/tesseroids-original