more specific info from irods exceptions stacktraces

[d-w-moore]

in the catch(const exception& e) clause in this and other places:

• schedule_policy_events_for_collection( ) routine in indexing_utilities.cpp - in this particular spot, could be query error like NO_COLUMNS... could switch on e.code( ) for resource message.

potentially more info could be given / specific cases handled by switching on e.code( )