MI breakpoint notifications.
* annotate.c (breakpoint_changed): Adjust parameter type.
* breakpoint.c (set_breakpoint_condition): Adjust to change
in breakpoint_modified type.
(breakpoint_set_commands): Likewise.
(do_map_commands_command): Likewise.
(bpstat_check_breakpoint_conditions): Notify that breakpoint has
changed after bumping hit count.
(bpstat_stop_status): Likewise.
(print_one_breakpoint_location): Don't wrap in tuple here.
(print_one_breakpoint): Always print individual locations.
For locations, use unnamed tuple.
(disable_breakpoints_in_unloaded_shlib): Notify that breakpoint
has changed.
(create_catchpoint, create_syscall_event_catchpoint): Call
breakpoint_created obsever.
(mention): Don't call breakpoint_created observer.
(create_breakpoint_sal): Call breakpoint_created observer.
(create_breakpoint, watch_command_1): Likewise.
(create_ada_exception_breakpoint): Likewise.
(delete_breakpoint): Call breakpoint_deleted breakpoint.
(locations_are_equal): New.
(update_breakpoint_locations): If locations were changed, notify.
(set_ignore_count, disable_breakpoint, do_enable_breakpoint):
Call breakpoint_modified observer.
* mi/mi-cmd-break.c (breakpoint_notify): Adjust.
(mi_cmd_break_insert): Don't set observers for modify and delete.
* mi/mi-interp.c (mi_suppress_breakpoint_notifications): New.
(mi_breakpoint_created, mi_breakpoint_deleted)
(mi_breakpoint_modified): New.
(mi_interpreter_init): Hook the above.
* mi/mi-main.c (mi_cmd_execute): Disable breakpoint notifications
while -break-* commands are executing.
* mi/mi-main.h (mi_suppress_breakpoint_notifications): New.
* mi/mi-out.c (struct ui_out_data): New field original_buffer.
(mi_redirect): New.
(mi_ui_out_impl): Hook in mi_redirect.
(mi_field_skip): True to the name, skip the field, don't output
a field with an empty value.
* python/py-breakpoint.c (gdbpy_breakpoint_created)
(gdbpy_breakpoint_deleted): Adjust.
* tui/tui-hooks.c (tui_event_create_breakpoint)
(tui_event_delete_breakpoint, tui_event_modify_breakpoint): Adjust.
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