Jack OS X updated to v0.80

Jack OS X has been updated to v0.80. This new version updates JackRouter to allow it to be selected as the default system audio device again, addressing an issue introduced by OS X 10.5.6. It also updates JackPilot to ensure that available sample rates for each device are now retrieved more reliably. Finally, it updates the Jackdmp server to the latest SVN version (1.91).