[Koha] Wipe Koha database (just auth and biblio records)

[Pablo Bianchi]

Hi Robin,

I'm aware about turning foreign keys constrains off is risky, what I was
trying to know is how risky could be, but OK, I realize that depends of
each database, and always a bad idea.

So at least we can say manual (and also bulkmarkimport.pl -d option) should
be updated (MySQL >~5.5)* adding a note about DELETE FROM biblio way not
always will work right away. This bring us to:

> In some cases the constraints will propagate the delete,
> in other cases they won't. These differences are by design.
There are good design reasons for no letting "delete biblio" table
propagate in all/any cases? Propagation in any case will make really simple
to update manual and bulkmarkimport.

*I'll then fill a bug report about this two issues (manual and
bulkmarkimport -d option) update.

​Regards,
Pablo
​