To follow through a discussion on gdb@ this patch adds annotation level 
three to the GDB sources.

Annotation level three:

- keeps the event notifications from annotation level two
- removes all the output markups

The assumption being that the client can use the more robust 
`interpreter mi ...' instead of those obnoxus[sp] markups.

comments?

Yes, this will mean a major revision of the documentation.

With this and its doco in, I think 5.4 is clear to go (or at least try to).

Andrew