[krbdev.mit.edu #1600] Comments on README

[Sam Hartman via RT]

Hi.  I was really impressed by the 1.3 README.  A lot of work went
into documenting the changes that happened.

I did notice a few small things that should be fixed.




* There's a todo note about ipv6

* The description of ticket 999 in the README seems inconsistent with
  the ticket.  I don't see how it has anything to do with GSS.

* Defaulting to addressless tickets and better NAT support should be
  listed as a major change.

* A spell check and type check pass should happen before release.

--Sam