Common V3 coding bug

[Benjamin Kosnik]

> > I would prefer the "this->member" form.
> 
> Yes, it's too easy to introduce new mistakes with the "using"
> approach.  When "this->" appears everywhere, uses without it
> stand out.  (Worst case is mixing them.)

Ok. Fine by me. Pending objections, this should be documented in 
C++STYLE, and the changes on the new C++ parser branch should be modified 
to take this into account.

Phil has happily agreed to be the ambassador to the new C++ Parser, so 
this should help him with this first bit.

-benjamin