obsoleting annotate level 2

[Andrew Cagney]

>  > Thus, while level one annotations are only a small maintenance burden,
>  > level two annotations are.  Even if Emacs had been using level two
>  > annotations for years, we would be trying to get rid of them.
> 
> A possible further reason for keeping level one annotations is that, like
> GDB/MI, it is really a machine interface (that is the output is intended to
> be read by a program). 
> 
> How about renaming it GDB/MI level 0 ;-)

Try `-1' :-)  mi level 0 was included in GDB 5.0.

Andrew