[Gm2] more iso libs in the cvs

[Gaius Mulley]

Hi,

here are the latest changes (mostly iso library additions, a real
number bugfix and a cygwin build fix):

    * gm2/gm2-libs/StringConvert.mod:  LongrealToString
      add test to see if the nonfraction component
      is empty.  Fixes a bug reported by Steve Giess
      <address@hidden>.
    * gm2/Make-lang.in:  LongIO.mod, RealIO.mod added
      to GM2-LIBS-ISO-MODS.
    * gm2/gm2-libs-ch/dtoa.c:  removed conditional
      compilation on HAVE_STRTOLD.
    * gm2/gm2-libs-ch/ldtoa.c:  fall back to using
      strtod if strtold is unavailable.
    * gm2/gm2-libs-iso/IOChan.mod:  fixed error
      message.
    * gm2/gm2-libs-iso/LongIO.mod:  tidied up comments.
    * gm2/gm2-libs-iso/LongIO.mod:  new implementation.
    * gm2/gm2-libs-iso/RealIO.def:  tidied up comments.
    * gm2/gm2-libs-iso/RealIO.mod:  new implementation.
    * gm2/gm2-libs-iso/SWholeIO.mod:  tidied up comments.
    * gm2/gm2-libs-iso/WholeIO.mod:  refactored to use
      writeString.
    * gm2/gm2-libs-iso/SLongIO.mod:  new implementation.
    * gm2/gm2-libs-iso/SRealIO.mod:  new implementation.
    * gm2/gm2-libs-iso/IOResult.mod:  new implementation.
    * gm2/gm2-libs-iso/SIOResult.mod:  new implementation.

I've seen cygwin make gm2.paranoid succeed but I've not yet run the
regression tests.

regards,
Gaius