Bug 8958: Make facets more UNIMARC compliant (revision 1)

Bug 8958: Make facets more UNIMARC compliant (revision 1)

Suppressions : I suppressed some indexes not existing in Unimarc : 603, 502,
504

Corrections :

  - Places : 651 was Marc21 => I put the right value (607)
  - Topics : 600a => 600ab (name/surname) ;  604a => 604at (author/title)

To test, take a record with 607, 600ab, 601ab, 604at, do a research matching
this record, and check if facets looks nicer that before...

Signed-off-by: Frédéric Demians <f.demians@tamil.fr>
Works as described. 607 for Places is very useful! Other tweakings make sense.

Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>