Bug 13224: use TOUT-UF8 base for z3950 BNF server

Bug 13224: use TOUT-UF8 base for z3950 BNF server

For using z3950 BNF server with utf8 encoding, one must use "TOUT-UF8" base.
See http://www.bnf.fr/fr/professionnels/recuperation_donnees_bnf_boite_outils/a.profil_z3950_bnf.html

Test plan :
- create a fresh koha install : UNIMARC and fr-FR with optional z3950 servers
- go to cataloguing
- click on "New from Z39.50/SRU"
- Perform searches on BNF2
=> Check that encoding is correct
- Choose a record and import
=> Check that encoding is correct

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
Trivial database field change, that reflects BnF recommended settings.

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
All instances have been changed. No problems found.

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>