merge "namespace octave" and OCTAVE_NAMESPACE_BEGIN/END blocks In files with both OCTAVE_NAMESPACE_BEGIN/END and "namespace octave" blocks, merge adjacent blocks. Use the macros in place of "namespace octave" in affected files and the corresponding header files. Files affected: call-stack.cc, call-stack.h, defaults.cc, defaults.h, defun-int.h, display.cc, display.h, environment.cc, environment.h, error.cc, error.h, event-manager.cc, event-manager.h, fcn-info.cc, fcn-info.h, help.cc, help.h, input.cc, input.h, interpreter.cc, interpreter.h, load-path.cc, load-path.h, load-save.cc, load-save.h, oct-hist.cc, oct-hist.h, pager.cc, pager.h, settings.cc, settings.h, sighandlers.cc, sighandlers.h, symtab.cc, symtab.h, sysdep.cc, sysdep.h, utils.cc, utils.h, __ode15__.cc, gzip.cc, ov-fcn-handle.cc, ov-fcn-handle.h, ov-java.cc, ov-java.h, ov-typeinfo.cc, ov-typeinfo.h, ov.cc, ov.h, octave.cc, octave.h, lex.ll, oct-parse.yy, profiler.cc, profiler.h, pt-eval.cc, and pt-eval.h.

--- a/libinterp/corefcn/defun-int.h	Sat Aug 14 18:55:37 2021 -0400
+++ b/libinterp/corefcn/defun-int.h	Sat Aug 14 21:50:26 2021 -0400
@@ -36,12 +36,9 @@
 
 class octave_value;
 
-namespace octave
-{
-  class interpreter;
-}
+OCTAVE_NAMESPACE_BEGIN
 
-OCTAVE_NAMESPACE_BEGIN
+class interpreter;
 
 extern OCTINTERP_API void print_usage (void);
 
@@ -67,10 +64,6 @@
 // Gets the shlib of the currently executing DLD function, if any.
 extern OCTINTERP_API dynamic_library get_current_shlib (void);
 
-OCTAVE_NAMESPACE_END
-
-namespace octave
-{
   // FIXME: this class doesn't seem to be used in Octave.  Is it
   // really needed?
 
@@ -86,7 +79,8 @@
 
     auto_shlib (const dynamic_library& shl) : dynamic_library (shl) { }
   };
-}
+
+OCTAVE_NAMESPACE_END
 
 // Some of these functions are widely used, so maybe we should avoid
 // deprecating them for now?