Add compilation option to allow faster or even instant reload for non-root users...

Add compilation option to allow faster or even instant reload for non-root users (#26)

* fcrontab: refactor sig_daemon() reload delay, add seconds to msg

* configure: add opt to decrease or remove non-root tab reload

* fcrontab: enforce max-fcrontab-delay-seconds in delay for non-root user

* configure: rename max-fcrontab-load => max-fcrontab-reload

* configure: expand usage for max-delay-reload

* fcrontab: refactor fcrontab reload delay calculation for clarity