* get.c (parse_read_command): Compact the values in the target

* get.c (parse_read_command): Compact the values in the target
dictionary, to save space.

* dictionary.c (struct copy_map): Removed.
(struct dict_compactor): Removed.
(dict_make_compactor): Removed.
(dict_compactor_compact): Removed.
(dict_compactor_destroy): Removed.

* procedure.c (struct data_set): Change `compactor' member to be a
struct case_map *.
(proc_open): Use case_map_to_compact_dict instead of
dict_make_compactor.
(proc_casereader_read): Use case_map_execute instead of
dict_compactor_compact.
(proc_commit): Use case_map_destroy instead of
dict_compactor_destroy.

* scratch-writer.c (struct scratch_writer): Change `compactor'
member to be a struct case_map *.
(scratch_writer_open): Use case_map_to_compact_dict instead of
dict_make_compactor.
(scratch_writer_casewriter_write): Use case_map_execute instead of
dict_compactor_compact.