zEventd improvenments

These are ADDITIONS to the #2085 pull request.

Commit 4433e3e will work for me, because I only use whole disks, but it will (very likely) break for anyone that uses partitions.

I'm going to look for the reason for this in the zed code if no one beats me to it.

I'm going to keep (force) pushing my changes to FransUrbo:zed, so this pull request should keep growing.