GUI: move the command queue into a separate class * main-window.cc (main_window): remove initializations of queue synchronization; (execute_command_in_terminal,run_file_callback,debug_continue,debug_step_into, debug_step_over,debug_step_out,debug_quit,closeEvent): adapt queuing commands; (queue_command): remove function for queuing a command; (execute_command_callback): move function from here into octave-cmd; * main-window.h: remove class variables related to the command queue_command * module.mk: add octave-cmd to the moc-list * octave-cmd.cc: new class octave_command_queue; (add_cmd): method for adding a command to the queue; (execute_command_callback): method for executing commands from the queue * octave-cmd.h: new class octave_command_queue

--- a/libgui/src/main-window.h	Sun Jan 03 11:49:16 2016 +0100
+++ b/libgui/src/main-window.h	Sun Jan 03 11:49:19 2016 +0100
@@ -36,7 +36,6 @@
 #include <QCloseEvent>
 #include <QToolButton>
 #include <QComboBox>
-#include <QSemaphore>
 #include <QPointer>
 
 // Editor includes
@@ -395,11 +394,9 @@
   // and related callback
 
   // the queue for the command structures
-  QList<octave_cmd *> _cmd_queue;
-  // semaphores used for handling the queue
-  QSemaphore   _cmd_processing;
-  QMutex       _cmd_queue_mutex;
+  octave_command_queue _cmd_queue;
 
+  // some class global flags
   bool _prevent_readline_conflicts;
   bool _suppress_dbg_location;
   bool _start_gui;