* editfns.c (Fdelete_and_extract_region): New function.

* editfns.c (Fdelete_and_extract_region): New function.
(syms_of_editfns): register it.
* insdel.c (del_range): update del_range_1 call.
(del_range_1, del_range_2): Add a ret_string argument to
request that the deleted text be returned.
(del_range_byte, del_range_both): Update del_range_2 call.
* lisp.h (del_range_1, del_range_2): change prototype
* casefiddle.c (casify_region): Update del_range_1 call.
* coding.c (code_convert_region): Update del_range_2 call.
* fileio.c (Finsert_file_contents): Update del_range_2 call.