This commit instantiates the "set_sticky_acknowledgment" CGI option -- refs #6237

This adds a modern-style option in the the CGIs to either set or
clear the "Sticky Acknowledgment" check-box by default.  There is
a competing "original" option, "sticky_ack", but which was not
fully instantiated in all programs nor very well documented.  The
modern idiom is to have checkbox-options begin with the keyword
"set_".

I strongly recommend deprecating the old option, but this commit
still allows both.  I have not changed "config.c" to include the
old option.  The new option has precedence over the old as evidenced
in cmd.c.

A translation from my English patch to the doco into German is required.
I am, unfortunately, a monoglot, and Google "translate" is seriously
lacking.

This commit tests OK in my Solaris-based environment.  Testing should
be undertaken in a Linux one to ensure compatibility and functionality.
Fix QA problem with "config-option-for-sticky-ack-6237"

This commit fixes a QA-related problem which could make the UI
display confusing things when trying to alter the "Sticky Acknowledgment"
tick-box.

The correct merge sequence for this is to first apply revision 1505fd78
and then immediately apply this one as this one fixes *just* the behaviour
problems.  Just applying this commit will miss infrastructure changes
that were necessary to define the desired behaviours.
added config option to cgi.cfg #6237

Refs: #6237
Merge branch 'feature/config-option-for-sticky-ack-6237' into next

Fixes: #6237

Conflicts:
	sample-config/updates/cgi.cfg_added_1.11_to_1.12.cfg