move parse tree classes inside octave namespace * lex.h, lex.ll, oct-parse.in.yy, parse.h, pt-all.h, pt-arg-list.cc, pt-arg-list.h, pt-array-list.cc, pt-array-list.h, pt-assign.cc, pt-assign.h, pt-binop.cc, pt-binop.h, pt-bp.cc, pt-bp.h, pt-cbinop.cc, pt-cbinop.h, pt.cc, pt-cell.cc, pt-cell.h, pt-check.cc, pt-check.h, pt-classdef.cc, pt-classdef.h, pt-cmd.cc, pt-cmd.h, pt-colon.cc, pt-colon.h, pt-const.cc, pt-const.h, pt-decl.cc, pt-decl.h, pt-eval.cc, pt-eval.h, pt-except.cc, pt-except.h, pt-exp.cc, pt-exp.h, pt-fcn-handle.cc, pt-fcn-handle.h, pt-funcall.cc, pt-funcall.h, pt.h, pt-id.cc, pt-id.h, pt-idx.cc, pt-idx.h, pt-jump.cc, pt-jump.h, pt-loop.cc, pt-loop.h, pt-mat.cc, pt-mat.h, pt-misc.cc, pt-misc.h, pt-pr-code.cc, pt-pr-code.h, pt-select.cc, pt-select.h, pt-stmt.cc, pt-stmt.h, pt-unop.cc, pt-unop.h, pt-walk.h, token.cc, token.h: Move classes and most functions inside octave namespace. Change all uses.

--- a/libinterp/dldfcn/audiodevinfo.cc	Thu Jan 19 14:47:19 2017 -0500
+++ b/libinterp/dldfcn/audiodevinfo.cc	Thu Jan 19 23:41:54 2017 -0500
@@ -543,8 +543,9 @@
   if (! player)
     error ("audio player callback function called without player");
 
-  octave_value_list retval = feval (player->octave_callback_function,
-                                    ovl (static_cast<double> (frames)), 1);
+  octave_value_list retval
+    = octave::feval (player->octave_callback_function,
+                     ovl (static_cast<double> (frames)), 1);
 
   if (retval.length () < 2)
     error ("audio player callback function failed");
@@ -1368,7 +1369,7 @@
     }
 
   octave_value_list retval
-    = feval (recorder->octave_callback_function, ovl (sound), 1);
+    = octave::feval (recorder->octave_callback_function, ovl (sound), 1);
 
   return retval(0).int_value ();
 }