GUI: support for octave arguments and integrate with run-octave. * src/octave.h (octave_initialize_interpreter, octave_execute_interpreter): New functions. (octave_cmdline_argc, octave_cmdline_argv, octave_embedded): New variables. * src/octave.cc (octave_cmdline_argc, octave_cmdline_argv, octave_embedded): New variables. (octave_initialize_interpreter, octave_execute_interpreter): New functions. (octave_main): Rewrite using them. * run-octave.in (octave_executable): New variable. (-gui): New option flag. * gui/src/octave-adapter/octave-main-thread.cc (octave_main_thread::run): Use octave_execute_interpreter. * gui/src/octave-gui.cc (dissociate_terminal): New function. (main): Use it. Also use octave_initialize_interpreter.

--- a/gui/src/octave-adapter/octave-main-thread.cc
+++ b/gui/src/octave-adapter/octave-main-thread.cc
@@ -27,8 +27,6 @@
 octave_main_thread::run ()
 {
   setlocale (LC_ALL, "en_US.UTF-8");
-  int argc = 1;
-  const char *argv[] = { "octave" };
   emit ready ();
-  octave_main (argc, const_cast<char**>(argv), 0);
+  octave_execute_interpreter ();
 }