Catalogue.pm : marc stuff :
* the 3 xxxSubfield functions works
* the addMarcBiblio function has been added : if you pass it a perlmarcstructure (sample in test.pl and explanation in marc/perlmarcstructure file), it adds a biblio to the marc_schema. The newbiblioitem (old koha-DB) still has to be updated to build the perlmarcstructure internally and call addMarcBiblio function.