(gdb-var-list): Change order of first two elements.

(gdb-var-list): Change order of first two elements.
(gdb-find-watch-expression): Make it work for arrays too.  Follow
change to gdb-var-list.
(gud-watch): Allow the user to enter variable name with a prexix
arg.  Create keybindings.
(gdb-var-create-handler, gdb-var-evaluate-expression-handler)
(gdb-var-list-children-handler, gdb-var-update-handler)
(gdb-var-delete, gdb-edit-value, gdb-speedbar-expand-node)
(gdb-var-list-children-handler-1, gdb-var-update-handler-1):
Follow change to gdb-var-list.
(gdb-starting): Don't show the overlay arrows when program is
running.