Adapt to new quota output
Showing size of the snapshots no longer works. In the past the output of the quota command looked like this:
qgroupid rfer excl
0/5 16.00KiB 16.00KiB
Nowadays it contains a patch as well and the final output is as follows:
Qgroupid Referenced Exclusive Path
0/1386 2.46GiB 60.34MiB @135
So updating schnapps to be able to parse the second output as well. In theory even better would be to use json output and do the math to get human readable output, but doing math in shell is not a great idea, so sticking with the text output for now.