(HASHKEY_TERMINAL): Remove.

(HASHKEY_TERMINAL): Remove.
(HASHKEY_MAX_NID): New macro.
(xrm_q_get_resource_1): Rename from xrm_q_get_resource.  Add extra
argument.
(xrm_q_get_resource): Call xrm_q_get_resource_1 with extra argument.
(xrm_create_database, xrm_q_put_resource)
(xrm_merge_string_database, xrm_q_get_resource_1)
(xrm_q_get_resource): Change resource database representation so that
it may not use multiple hash tables for a single database.
[TARGET_API_MAC_CARBON] (xrm_cfproperty_list_to_value): YAILOM.