and a bit more of a framework to keep track of running processes
(still in the works)
partial support for keeping output files, but no method of triggering that
(we may want to use a specific world.error or something)

I had not noticed the -p option, which doesn't really make sense and should perhaps be removed, but that one actually does work with relative paths, so the original 'fix' was bad

plus a couple of fixes to make relative paths work in bind10 -c