Upgrade parallels to 10.1.0-28600 and remove permission hack

This removes the permission hack that was addressed in #6699 - and upgrades to the latest version available (10.1.0).  It also makes the package visible on install, since it was hidden in the DMG.

This should not be merged in until the fix for #6699 is merged in as well...or it will break for anyone not running HEAD.