Improve scope inspect

[jrcheli]

I had a filter file on my system from an earlier scope start command. I didn't realize this file was in place.

This filter file was preventing me from getting any output from a command I was trying to scope (it wasn't in the allow list). I can't remember if it was from LD_PRELOAD or a scope run. In any case, when I tried to investigate with a scope ps and scope inspect I didn't get any output for the my scoped command and my favorite way of debugging (scope inspect) came up empty.

One proposal is to improve scope inspect to 1) look for a filter file and if one is in place, 2) report something that lets people know that the filter file is one reason they might not be getting any output from a their commands.