Bug 15704: Split up Zebra indexing of RDA 264 information

Bug 15704: Split up Zebra indexing of RDA 264 information

To test:
1 - Add a record with a unique publisher "Supercalifragilistic" in the
264 b field
2 - Search for the value
3 - Record not found
4 - Apply patch (may need ot copy the .xml file into koha install)
5 - Reindex all the things
6 - Search for the value
7 - Success!

Signed-off-by: Felicia Martin <felicia.martin@dncr.nh.gov>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 3599e57bf67a1357c13903fbf07f07cb2c94e756)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>