This changeset reverts GDB Graphical Interface to use annotations. It incorporates...

(and never released) on the EMACS_23_1_RC branch.  Namely reverse debugging and the display of STL
collections as watch expressions.

The long term aim is to move to GDB/MI, so these changes will be re-instated at some time in the future.
At the moment, however, there are issues with gdb-mi.el that have not yet been solved, e.g, bug#5145.