repetable field support.

repetable field support.
The 3 problem from yesterday are fixed :
* cc the + to each tab (for instance, only in tab 0)
* doing the french template
* fixing an annoying bug : everything is stored in the same field :
200$a$b$c$a$b$c and not
200$a$b$c
200$a$b$c
as expected.

100% FUNCTIONNAL (at least I expect !)

IMPORTANT NOTE :
ALL subfields from a field MUST be in the same tab. Otherwise, Koha can't magically find how to group subfields in case of repeted fields.
I'll add a check in checkmarc immediatly.
That's not a "bug" in Koha. That's mandatory because of MARC structure.