opt/j2re and opt/j2sdk renamed

Hi everybody, Just a quick note to inform you that we renamed j2sdk and j2re resp. to jdk and jre; you may need to manually remove the old package with pkgrm and install the new one. For port maintainers, also remember to update the dependencies with the new names in your ports. Regards, Simone -- Simone Rota Bergamo, Italy - http://www.varlock.com