(set_image_of_range_1): New function.

(set_image_of_range_1): New function.
(set_image_of_range): Use set_image_of_range_1 for Latin-1.
Return a value to indicate running out of memory.
(SET_RANGE_TABLE_WORK_AREA): Check value from set_image_of_range.
(extend_range_table_work_area): New subroutine.
(EXTEND_RANGE_TABLE): Replaces EXTEND_RANGE_TABLE_WORK_AREA.
Different calling conventions, and used from set_image_of_range{,_1}.
(IMMEDIATE_QUIT_CHECK): Definitions moved.