Bug 6496 - correct the order of the author display in the OPAC

Bug 6496 - correct the order of the author display in the OPAC

This sets the order the fields are displayed in to be as it is in the
MARC (typically numerical order), rather than 100,700,110,710,... like
it was.

Basically, it's a port of the way it's done in the staff client. As
such, it should be able to handle a lot more than it could previously,
including relator codes.

(replaces the previous commit, just removing an erronious comment and
making the commit message more accurate)

Conflicts:

	koha-tmpl/opac-tmpl/prog/en/xslt/MARC21slim2OPACDetail.xsl

Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>