cobol: Improve binary conversion from packed-decimal and numeric-display.

cobol: Improve binary conversion from packed-decimal and numeric-display.

There are routines that create GENERIC conversion routines that convert
packed-decimal and numeric-display variables to binary.  Some are in
libgcobol, and some have direct GENERIC implementations.  All have been
updated to use faster divide-and-conquer algorithms.

The new routines are ten to twenty times faster than the prior versions.

gcc/cobol/ChangeLog:

	* genapi.cc (parser_enter_file): Establish a var_decl for the
	common packed-decimal to binary conversion table.
	* genutil.cc (digit): Divide-and conquer numeric-display converter.
	(num_disp_dive): Likewise.
	(pd_dive): Divide-and-conqure packed-decimal converter.
	(get_pd_value): Likewise.
	(get_binary_value_tree): Use the new routines.
	(binary_from_FldNumericBinary):  Divide-and conquer numeric-display
	converter.
	* genutil.h: Declaration for var_decl_dp2bin.
	* move.cc (mh_little_endian): Allow FldPacked as a source.

libgcobol/ChangeLog:

	* charmaps.cc: Eliminate rt_encoding_t.
	* libgcobol.cc (console_init): Change how __gg__console_encoding is
	established.
	(initialize_program_state): Likewise.
	(get_binary_value_local): Use new conversion algorithms.
	(__gg__move): Likewise.
	* stringbin.cc (__gg__numeric_display_to_binary):  Likewise.
	(digit_rt): Likewise.
	(num_disp_dive_rt): Likewise.
	(pd_dive_rt): Likewise.
	(__gg__packed_to_binary): Likewise.
	* stringbin.h (STRINGBIN_H_): Declaration for __gg__dp2bin.
	(__gg__numeric_display_to_binary): Use new algorithms.
	(__gg__packed_to_binary): Likewise.