show line number in left part of screen (hotkey alt-n)
add option editor_line_status to ini (src/setup.c)
add action CK_Toggle_Line_State (edt/editcmddef.h)
change "print_to_widget()" to show line state, if option_line_state = 1 show line num (edit/editdraw.c)
change "edit_draw_this_line()", (set line state: line num, etc)
add const LINE_STATE_WIDTH, add options: option_line_state, option_line_state_width (edit/edit.h)
add switch on/off show line number (edit/edit.c)
add CK_Toggle_Line_State to translation table command_names (bindings name is Toggle-Line-State).
add const LINE_STATE_COLOR for draw left area bar line state
add color pair "editlinestate" for set in ini
add help for keyword "editlinestate" on "mc --help-color" (src/main.c)