* breakpoint.c (all_breakpoints_info, breakpoint_1): Add 'info

* breakpoint.c (all_breakpoints_info, breakpoint_1):  Add 'info
all-breakpoints' command.
* (get_number):  Allow users to enter negative breakpoint numbers.
* (breakpoint_1):  Reformat display of 'info break' to show new
fields.
* (create_longjmp_breakpoint, breakpoint_re_set,
breakpoint_re_set_one, enable/disable_longjmp_breakpoint),
symfile.c  (syms_from_objfile):  Re-do
insertion of longjmp breakpoints.  Move all code into
breakpoint_re_set, and call that instead of
create_longjmp_breakpoint in symfile.c.