Bug 22824: Remove C4::Boolean, true_p, boolean_preference, etc.
It seems that we don't really need all this overhead.
YesNo must be a boolean and contain 1 or 0.
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com> Signed-off-by: Julian Maurice <julian.maurice@biblibre.com> Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com> Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org> Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>