New feature from SAN Ouest Provence: ability to reserve a specific item in

New feature from SAN Ouest Provence: ability to reserve a specific item in
the intranet. The development was made on branch 2.2 by Arnaud Laurin from
Ouest Provence and integrated on HEAD by Pierrick Le Gall from INEO media
system.

New page reserve/request.pl taking a biblionumber as entry point.

New functions:

- C4::Biblio::get_iteminfos_of retrieves item informations for a list of
  itemnumbers

- C4::Biblio::get_biblioiteminfos_of retrieves biblioitem informations for a
  list of biblioitemnumbers

- C4::Biblio::get_itemnumbers_of retrieve the list of itemnumbers related to
  each biblionumber given in argument.

- C4::Circulation::Circ2::get_return_date_of retrieves return date for a
  list of itemnumbers.

- C4::Koha::get_itemtypeinfos_of retrieves the informations related to a
  list of itemtypes.

- C4::Koha::get_branchinfos_of retrieves the informations related to a list
  of branchcodes.

- C4::Koha::get_notforloan_label_of retrives the list of status/label for
  the authorised_values related to notforloan.

- C4::Koha::get_infos_of is the generic function used by all get_*infos_of.

- C4::Reserves2::GetNumberReservesFromBorrower

- C4::Reserves2::GetFirstReserveDateFromItem

Modified functions:

- C4::Reserves2::FindReserves was simplified to be more readable.

The reservation page is reserve/request.pl and is linked from nowhere as
long as zebra is not stable yet on HEAD.