move new interpreter class to separate file * libinterp/corefcn/interpreter.cc, libinterp/corefcn/interpreter.h: New files. Move interpreter class and some supporting functions here from octave.h, octave.cc, toplev.h, and toplev.cc. Move main_loop into the interpreter class. Handle exiting with a separate exception object from interrupts, passing the exit status with the object. Update other files as needed to remove toplev.h or include interpreter.h instead of toplev.h. * libinterp/corefcn/module.mk: Update. * toplev.h: Deprecate.

--- a/libinterp/corefcn/sighandlers.cc	Tue Jul 12 10:17:45 2016 +0200
+++ b/libinterp/corefcn/sighandlers.cc	Mon Jul 11 18:05:53 2016 -0400
@@ -45,6 +45,7 @@
 #include "defun.h"
 #include "error.h"
 #include "input.h"
+#include "interpreter.h"
 #include "load-save.h"
 #include "octave.h"
 #include "oct-map.h"
@@ -53,7 +54,6 @@
 #include "pt-eval.h"
 #include "sighandlers.h"
 #include "sysdep.h"
-#include "toplev.h"
 #include "utils.h"
 #include "variables.h"