cobol: Bring EBCDIC NumericDisplay variables into IBM compliance.

cobol: Bring EBCDIC NumericDisplay variables into IBM compliance.

The internal representation of Numeric Display (ND) zoned decimal variables
when operating in EBCDIC mode has been brought into compliance with IBM
conventions.  This requires changes to data input, data output, internal
conversion of zoned decimal to binary, and variable assignment.

gcc/cobol/ChangeLog:

	* genapi.cc (compare_binary_binary): Formatting.
	(cobol_compare): Formatting.
	(mh_numeric_display): Rewrite "move ND to ND" algorithm.
	(initial_from_initial): Proper initialization of EBCDIC ND variables.
	* genmath.cc (fast_add): Delete comment.
	* genutil.cc (get_binary_value): Modify for updated EBCDIC.

libgcobol/ChangeLog:

	* common-defs.h (NUMERIC_DISPLAY_SIGN_BIT): New comment; new constant.
	(EBCDIC_MINUS): New constant.
	(EBCDIC_PLUS): Likewise.
	(EBCDIC_ZERO): Likewise.
	(EBCDIC_NINE): Likewise.
	(PACKED_NYBBLE_PLUS): Likewise.
	(PACKED_NYBBLE_MINUS): Likewise.
	(PACKED_NYBBLE_UNSIGNED): Likewise.
	(NUMERIC_DISPLAY_SIGN_BIT_ASCII): Likewise.
	(NUMERIC_DISPLAY_SIGN_BIT_EBCDIC): Likewise.
	(SEPARATE_PLUS): Likewise.
	(SEPARATE_MINUS): Likewise.
	(ZONED_ZERO): Likewise.
	(ZONE_SIGNED_EBCDIC): Likewise.
	* configure: Regenerate.
	* libgcobol.cc (turn_sign_bit_on): Handle new EBCDIC sign convention.
	(turn_sign_bit_off): Likewise.
	(is_sign_bit_on): Likewise.
	(int128_to_field): EBCDIC NumericDisplay conversion.
	(get_binary_value_local): Likewise.
	(format_for_display_internal): Likewise.
	(normalize_id): Likewise.
	(__gg__inspect_format_1): Convert EBCDIC negative numbers to positive.
	* stringbin.cc (packed_from_combined): Quell cppcheck warning.

gcc/testsuite/ChangeLog:

	* cobol.dg/group2/ALLOCATE_Rule_8_OPTION_INITIALIZE_with_figconst.out:
	Change test for updated handling of Numeric Display variables.