Update: Centralize common error function, minor cleanups, and improve status code...

Update: Centralize common error function, minor cleanups, and improve status code programs.

Printing an error for two different long parameters that cannot be used together is very common.
Move this into a single function inside of fll_program.
Make sure that these calls are wrapped in appropriate verbosity checks.

The status code programs is now able to print the number with the error bit and/or warning bit set.
The status code programs status codes error and warning can be used together when using the -n/--number.

Perform minor cleanup where the "main->parameters.remaining.used > 0" can be simplified.