Do not include <print-copyr.h>.

Include <getdate.h>.
(get_date): Remove decl.
(ATIME_PRESERVE_OPTION, CHECKPOINT_OPTION, FORCE_LOCAL_OPTION,
IGNORE_FAILED_READ_OPTION, INDEX_FILE_OPTION, NO_OVERWRITE_DIR_OPTION,
NUMERIC_OWNER_OPTION, RECURSIVE_UNLINK_OPTION, REMOVE_FILES_OPTION,
SHOW_OMITTED_DIRS_OPTION, TOTALS_OPTION): New constants.
(long_options, decode_options): Use them.
(OVERWRITE_DIR_OPTION): Remove.
(long_options): New options --index-file, --no-overwrite-dir.
Remove --overwrite-dir option.
(usage): Use PACKAGE_BUGREPORT.
(decode_options): Terminate new argv properly.
Use PACKAGE_NAME, PACKAGE_VERSION.
If verbose, report how we grokked any textual date option.
(main): Add support for index-file.