Calling inferior functions and MI notification

[Vladimir Prus <vladimir@codesourcery.com>]

Hello,
presently, when a GDB command calls an inferior function, for
example:

	-data-evaluate-expression foo()

the MI frontend is not informed in any way. So, should the function
get stuck, the user will not even understand that inferior is running,
and will have hard time figuring that he should click the "interrupt"
button, or whatever.

Ideally, the output should be like this:

	(gdb) -data-evaluate-expression foo()
	*running,thread-id="1"
	*stopped
	^done,result="100"

However, I believe that making such a change will immediately break both KDevelop
and Eclipse CDT -- because whenever they see *stopped, a full refresh of everything
is done. If any variable object involves function call, *stopped will be emitted
again, and cause another refresh. At least, I cannot see anything protecting
from that.

So, we have two solutions:
1. Just don't emit those notification for inferior function calls.
2. Don't emit them by default. Provide a command to enable this new
behaviour.

Comments or better suggestions?

- Volodya