* real.h (SIGNIFICAND_BITS): Add one more word.
(CONST_DOUBLE_FORMAT): Accomodate 6 words.
* real.c (times_pten): New.
(real_to_decimal, real_from_string): Use it.
(sticky_rshift_significand): Use & to find modulus.
(rshift_significand, lshift_significand): Likewise.
(do_divide): Apply sticky bit after normalization.
(real_to_decimal, real_to_hexadecimal): Fix sign of Inf and NaN.
From-SVN: r57811
