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/octave-value/ov.h	Sat Aug 14 18:55:37 2021 -0400
+++ b/libinterp/octave-value/ov.h	Sat Aug 14 21:50:26 2021 -0400
@@ -45,11 +45,12 @@
 #include "oct-time.h"
 #include "str-vec.h"
 
-namespace octave
-{
+OCTAVE_NAMESPACE_BEGIN
+
   class stack_frame;
   class type_info;
-}
+
+OCTAVE_NAMESPACE_END
 
 class Cell;
 class float_format;
@@ -1643,8 +1644,8 @@
 
 // Non-member unary and binary operations on octave_value objects.
 
-namespace octave
-{
+OCTAVE_NAMESPACE_BEGIN
+
   extern OCTINTERP_API octave_value
   unary_op (type_info& ti, octave_value::unary_op op,
             const octave_value& a);
@@ -1692,7 +1693,8 @@
 
     return colon_op (base, octave_value (), limit, is_for_cmd_expr);
   }
-}
+
+OCTAVE_NAMESPACE_END
 
 #if defined (OCTAVE_PROVIDE_DEPRECATED_SYMBOLS)
 OCTAVE_DEPRECATED (7, "use 'octave::unary_op' instead")