merge input and output of exp. terminal widget into one widget * command-widget.cc (command_widget): remove obsolete elements, use new class console as terminal, update initializations; (init_command_prompt): display the first prompt, this function is called when the interpreter is ready (via main_window); (update_prompt): prompt is a QString now; (insert_interpreter_output): use m_console instead of m_output_display; (accept_input_line): moved to console; (process_input_line): string of input line is passed as argument, a new prompt is provided when interpreter is ready (notice_settings): update for m_console, remove color and configuration of obsolete line edit (console::console): initializations, create and set QTextDocument; (console::new_command_line): Prepare a new command line with prompt; (console::accept_command_line): get input string and pass it to m_command_widget for processing; (console::append_block): append a text block to the document; (console::keyPressEvent): re-implement key event for filtering return, on which accept_input_line is called * command-widget.h: new class console, update some function arguments * main-window.cc (handle_octave_ready) call init_command_prompt of terminal_dock_widget * terminal-dock-widget.cc (init_command_prompt): new function calling related function of the command widget * terminal-dock-widget.h: new function init_command_prompt

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