Bug 26853: Harmonize import_biblios with biblio and biblioitems

Bug 26853: Harmonize import_biblios with biblio and biblioitems

This patch harmonizes the column datatypes of import_biblios
with biblio and biblioitems to prevent database errors which cause
staged MARC uploads to sometimes fail to update 100% correctly.

To test:
1. Go to http://localhost:8081/cgi-bin/koha/tools/stage-marc-import.pl
2. Upload a file with MARC records with titles longer than 128
characters long
3. Click "Stage for import"
4. Monitor /var/log/koha/kohadev/intranet-error.log for
database errors
5. Note that there are no database errors

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>