Remove unused status widgets

	* src/persp/dbgperspective/menus/menus.xml: Remove commands, errors,
	and target output menu items.
	* src/persp/dbgperspective/nmv-dbg-perspective.cc
	(DBGPerspective::Priv::Priv): Stop initializing commands, errors,
	and target output datas.
	(DBGPerspective::on_show_commands_action): Removed
	(DBGPerspective::on_show_errors_action): Removed
	(DBGPerspective::on_show_target_output_action): Removed
	(DBGPerspective::on_insert_in_command_view_signal): Removed
	(DBGPerspective::on_show_command_view_changed_signal): Removed
	(DBGPerspective::on_show_target_output_view_changed_signal): Removed
	(DBGPerspective::on_show_log_view_changed_signal): Removed
	(DBGPerspective::on_debugger_console_message_signal): Removed
	(DBGPerspective::on_debugger_target_output_message_signal): Removed
	(DBGPerspective::on_debugger_log_message_signal): Removed
	(DBGPerspective::on_activate_output_view): Removed
	(DBGPerspective::on_activate_logs_view): Removed
	(DBGPerspective::get_command_view): Removed
	(DBGPerspective::get_command_view_scrolled_win): Removed
	(DBGPerspective::get_target_output_view): Removed
	(DBGPerspective::get_target_output_view_scrolled_win): Removed
	(DBGPerspective::get_log_view): Removed
	(DBGPerspective::get_log_view_scrolled_win): Removed
	(DBGPerspective::set_show_command_view): Removed
	(DBGPerspective::set_show_target_output_view): Removed
	(DBGPerspective::set_show_log_view): Removed
	(DBGPerspective::add_text_to_command_view): Removed
	(DBGPerspective::add_text_to_target_output_view): Removed
	(DBGPerspective::add_text_to_log_view): Removed
	(DBGPerspective::show_command_view_signal): Removed
	(DBGPerspective::show_target_output_view_signal): Removed
	(DBGPerspective::show_log_view_signal): Removed
	(DBGPerspective::on_debugger_command_done_signal): Stop updating
	the command view.
	(DBGPerspective::init_perspective_menu_entries): Remove code hiding
	the command, log, and target output view.
	(DBGPerspective::init_actions): Stop initializing the command, log,
	and target output menu entries.
	(DBGPerspective::init_body): Stop initializing the command, log,
	and target output view.
	(DBGPerspective::init_signals): Stop inializing the command, log,
	and target output signals.
	(DBGPerspective::init_debugger_signals): Likewise
	* src/persp/dbgperspective/nmv-dbg-perspective.h
	(DBGPerspective::add_text_to_command_view): Removed
	(DBGPerspective::add_text_to_target_output_view): Removed
	(DBGPerspective::add_text_to_log_view): Removed