M-x gdb uses GDB-MI again

[nickrob@snap.net.nz (Nick Roberts)]

At Cyd's request, I have reinstated the GDB-MI code in the trunk.  Now if you
do M-x gdb, you should get something like:

Run gdb (like this): gdb -i=mi

You can't edit this to use annotations or the fullname option.  If you want
Emacs 21 style behaviour you need to start GDB with M-x gud-gdb.

Unlike annotations, GDB/MI output has a formal syntax which should reduce the
likelihood of breakage between GDB versions and eases maintenance.  It also
supports new features of GDB such as stopping and stepping through individual
threads of a multi-threaded program.

-- 
Nick                                           http://users.snap.net.nz/~nickrob