Update: Execute changes and controller program changes.

Update: Execute changes and controller program changes.

Tweak some of the execute status codes.
I confused the errno parameters for what I was using F_execute_off for.
Change F_execute_off to F_execute_bad to more accurately reflect what the error code represents.

Add additional execute status codes.
Provide a F_format and F_format_not status codes.

Pass through non-negative, non-zero, exec return codes.
For negative return codes that is not -1, set the execute error code to F_execute_failure.

Improve error printing in controller program on child process failure.

Start to cleanup print functions.
There already is data being passed via the f_process_t, use those to better reduce the number of parameters passed to relevant functions.
There is much more work in this regards to do, but that is to be done at another time.

The controller program threads should exit with child code only if the child code is non-zero.
When the child code is zero, then the normal (and preferred) thread exit is allowed to perform.