Bug 13359 - allow the packages to use virtual-mysql-*

Prior to this patch, the koha packages depended on mysql-client. This
meant that it was tricky to use things such as the MariaDB libraries
instead.

This patch recommends mysql, but will accept mariadb and other things
that are marked by debian as able to replace mysql.

Signed-off-by: wajasu <matted@34813.mypacks.net>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
(cherry picked from commit 9419177a1e39296fe1049b44fb9788eeb4341b77)
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Bug 12567: Make catalog statistics wizard publication year work for MARC21

Publication year was useless for MARC21, as it was using the
biblioitems.publicationyear (UNIMARC) instead of biblio.copyrightdate
(MARC21).

This patch tries to fix the search options to work for both MARC
flavours.

To test:
In Reports > Statistics wizards > Catalog:
- Test the publication year search options on a UNIMARC and
  a MARC21 installation.
- Make sure search results make sense for both.

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
The changes are fine with me, but this script is certainly not bug free.
Also note that all its SQL should be moved out according to our
coding guidelines. When doing so, a rewrite would be appropriate.

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
(cherry picked from commit 865996d097bbc4cc36fdb5231bacfaed822cfd54)
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>