gui: provide prefernces for the octave directory at startup * settings-dialog.ui: add check box for restoring previous octave directory and line edit / file dialog for setting startup directory * settings-dialog.cc (constructor): init new input widgets from settings; (write_changed_settings): wirte values from new widgets into settings file; (get_octave_directory): new slot for settings octave dir in a file dialog * main-window.h: new slot handle_octave_ready * main-window.cc (handle_octave_ready): depending on settings set octave directory to the last one from the previous session, the one set in the settings or the current one; (construct): do not set dir here but in handle_octave_ready; (construct_octave_qt_link): pass 'this' to octave link as parent; * octave-interpreter.h: new signal inidication interpreter is initialized * octave-interpreter.cc (constructor): emit new signal after init of interpreter * octave-qt-link.cc (constructor): connect new signal with slot in main window

--- a/libgui/src/octave-qt-link.cc	Sat Jan 18 08:50:03 2014 -0500
+++ b/libgui/src/octave-qt-link.cc	Sun Jan 19 11:30:15 2014 +0100
@@ -43,13 +43,16 @@
 
 #include "resource-manager.h"
 
-octave_qt_link::octave_qt_link (void)
+octave_qt_link::octave_qt_link (QWidget *p)
   : octave_link (), main_thread (new QThread ()),
     command_interpreter (new octave_interpreter ())
 {
   connect (this, SIGNAL (execute_interpreter_signal (void)),
            command_interpreter, SLOT (execute (void)));
 
+  connect (command_interpreter, SIGNAL (octave_ready_signal ()),
+           p, SLOT (handle_octave_ready ()));
+
   command_interpreter->moveToThread (main_thread);
 
   main_thread->start ();