0.04
  - Use float.h's LDBL_DIG to set the initial value of _DIGITS in LongDouble.xs.
  - Add _LDBL_DIG XSub so that we can see the value of float.h's LDBL_DIG.
  - Amend t/prec.t to work with powerpc64 (where long double has 106 bits of
    precision).
 0.03
  - Fix LDtoLD and STRtoLD documentation.
  - Alter the way that strEQ gets hold of HvNAME(SvSTASH(SvRV(sv))) - so that -Wall
    doesn't emit "null argument" warnings. (Thanks Daniel Kahn Gillmor.)
  - Add t/stringification.t.
  - Fix typos in documentation.
  - Fix bug in new() - it wasn't handling infinity/nan args correctly.

 0.02
  - Replace '_precision' (not exported) with 'ld_get_prec' (exported).
  - Provide 'ld_set_prec'.
  - Remove LONG_DOUBLE_DECIMAL_PRECISION macro.
  - Provide LdtoSTRP.
  - set default precision of stringified values to 18 decimal digits.