Reorganize gatekeeper script to sort subs ahead of their callers

Reorganize gatekeeper script to sort subs ahead of their callers

Prior to committing, this was validated with:
(DIFF='git diff --cached';
 comm -3 <($DIFF | grep ^- | sed -e 's/^-//' | sort) \
         <($DIFF | grep ^+ | sed -e 's/^+//' | sort) )

The output shows only blank lines, comments, and a diff header were
added, and only a diff header removed, after all lines are sorted
and paired for analysis.  To replicate, change the "git diff" command
to compare this commit with its parent.