Fix printing of spaces. Currently the timestamp and the next field are printed
as one.
Ignore executables.

Oops, 32f3a0d3863b43baabf12fa4eab3669c2ad305d1 should only have changed the Makefile for `make clean`.
Remove unused prototype
Make -a obsolete, accept -M as an option.
Correct error messages
Factorize pool_config creation with defaults.
Clean wq pool config reading to make options evident.
wq_pool man auto pool documentation.

Still missing billing_cycle and worker_terminate_boundary.
Make sure min_workers greater than 0.