[Matrix-SIG] Credit where credit is due.

[Travis Oliphant]

I apologize to Scott Ransom and Michael Haggerty for incorrectly citing
Michael Hudson as originator of the idea for an attribute that causes no
upcasting.  

I went back and reviewed the discussion on this list of June and July last
year and saw that it was really the conversation between Scott Ransom, Tim
Hochberg, Rick White, and Michael Haggerty that produced the idea of a
typecode attribute to help in the upcasting problem.  Their idea is
essentially what was implemented.  

I also saw that the disagreement about how to handle the case of two
arrays with this property was also present in the discussion :-)

--Travis