128 bit signed and unsigned integer types

[dsimcha]

== Quote from Walter Bright (newshound1 at digitalmars.com)'s article
> bearophile wrote:
> > I have already answered something in another post. But instead of
> > asking us/yourself if we can use the feature X, why don't you think
> > about implementing the features Y and Z that are most useful to
> > programmers, like, for example, named arguments (and several other
> > things discussed in the past)? I can find many uses for named
> > arguments and only one or two for 128-big integral numbers...
> >
> > I know the story of the car/horse by Ford, but often the users know
> > what they need :-) I may use several things currently absent in D2
> > while I have little use of many of the things recently added/modified
> > in D2. (for example I may like the idea of vector operations, but so
> > far I haven't used them yet in actual programs, while I can think of
> > several other things missing still that I can find useful today, that
> > are missing still in D2).
> Yet in the past, many people asked for vector operations.

I absolutely *love* the vector ops, except that they're kind of buggy.  The only
reason I haven't filed bug reports is that the bugs are kind of hard to reproduce.
 Now that it's been brought to my attention and I have some free time, maybe I'll
try to reproduce and file some of them.