Bug 22824: Correct on/off behaviour

Bug 22824: Correct on/off behaviour

Here things are starting to be a bit tricky.
IMO we don't want to replicate the ImplicitTyping behaviour from
YAML::Syck but handle correctly the different value.
We have the list of available values in the .pref file, the values in DB
must match them.

We want 1 or 0 in DB.

2 more occurrences:
finesMode => Dealt on bug 27676 ('off' is ok here)
itemBarcodeInputFilter => 'OFF' is correct here

Note that we don't use ~ or true/false in *.pref

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>