(parse_nested_list_value): Fix handling of the global

(parse_nested_list_value): Fix handling of the global
definition.
(get_nested_list): Get global definitions by load_partial_im_info.
(preedit_commit): Set ic->candidates_changed to bitwise or of enum
MInputCandidatesChanged.
(take_action_list): Likewise.
(reset_ic): Likewise.
(create_ic): Don't pay special attention to
Mcandidates_group_size.
(load_partial_im_info): Call mdatabase_find with correct 4th arg.
(minput_set_variable): Get a definition of varible by
mplist_find_by_value, not mplist_get.