Explicitly Support Placing "In-Network" Holds

Explicitly Support Placing "In-Network" Holds

In a consortial setting, SHAREit can be told the makeup of your
local "network" of systems, and if an item can be found in-network,
a local hold can be placed instead of an ILL request. Without this
change, the item must be held by the user's home library specifically.

Signed-off-by: Jason Boyer <jboyer@library.in.gov>