Add and use a patron search that overrides opt-in invisibility

Add and use a patron search that overrides opt-in invisibility

Something like this is required for API calls that need to operate
against a number of libraries in a given instance that are using opt-in;
otherwise, attempts to search for users will fail and you may end up
creating near-duplicates etc.

The implementation adds an
open-ils.actor.search.patron.advanced.opt_in_override method to
open-ils.actor, which, if invoked, checks to see if the caller has the
OPT_IN_OVERRIDE permission. If so, then the crazy_search ignores the
normal opt-in limits and searches all pertinent users in the database.

As a global permission, OPT_IN_OVERRIDE is a blunt instrument. Others
might want to put together a more refined version that uses OU depths to
define boundaries.

Signed-off-by: Dan Scott <dscott@laurentian.ca>