[RFA] Add some VAX floating point formats to floatformat.[ch]

[Paul Koning]

>>>>> "Jan-Benedict" == Jan-Benedict Glaw <jbglaw@lug-owl.de> writes:

 >> Ok well then how about the comment containing a quick precis of
 >> the VAX format.  I am sure that various people will be interested
 >> to read it.

 Jan-Benedict> That's actually quite simple: transcribe the nice
 Jan-Benedict> pictures in the VAX Architecture Reference Manual into
 Jan-Benedict> ASCII art and give a specific example for one number.

Or copy the reference from real.c in gcc.

   paul