Bug 17457: Add tests for each marc flavour

Bug 17457: Add tests for each marc flavour

+ Added a `run_flavoured_tests` sub that runs for each MARC flavour
* Moved SearchWithISBNVariation tests to the new sub

I copied a lot of the necessary utility functions over Biblio.t (as of Jonathan's suggestion). I also tried to name and organize the code in such a way that it can be reused if anyone else needs to run "flavoured" tests in the future.

prove t/db_dependant/Acquisition.t  OK
QA tool green

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>