added error checking so that users get a reasonable error message if the permissions on the kinect usb device in /dev is wrong
applied another patch from stephane which adds proper subsampling for the asus xtion
applied stephane magnenat's patch to fix subsampling (only seems to fix the problem for the kinect though, and not the asus)
First release as unary stack. For previous changes, see openni_kinect/ChangeList.