move more common code from dock widgets into octave-dock-widget.h * terminal-dock-widget.cc, file-editor.cc, files-dock-widget.cc, workspace-view.cc (constructor): remove connectiong changed_settings signal * files-dock-widget.cc/.h, file-editor.h: do not include QSettings here * octave-dock-widget.h(constructor): connect changed_settings signal * octave-dock-widget.h: include QSettings, empty virtual slot notice-settings

gnulib-hg = gnulib-hg