[rfc] Annotation level THREE

[Andrew Cagney]

> -var-create - * i
> ^done,name="var1",numchild="0",type="int"
> (gdb) 
> -var-create - * r
> ^done,name="var2",numchild="10",type="double [10]"
> (gdb) 
> set var i=3

Do -var-assign or -var-evaluate-expression work?  Regardless, this looks 
like a bug.

> &"set var i=3\n"
> ^done
> (gdb) 
> -var-update *
> ^done,changelist=[{name="var1",in_scope="true",type_changed="false"}]
> (gdb) 
> set var r[3]=6
> &"set var r[3]=6\n"
> ^done
> (gdb) 
> -var-update *
> ^done,changelist=[]
> (gdb)