Change charMatrix to subclass charNDArray rather than be another Array<char>. * chMatrix.h: both charMatrix and charNDArray are Array<char>, the first being simply 2 dimensional. We change this so that charMatrix inherits from charNDArray instead. * chMatrix.cc: remove all constructors which are now inherited from charNDArray. * chNDArray.h, chNDArray.cc: implement all constructors here rather than calling charMatrix. Remove matrix_value() since a charMatrix constructor is now enough. * pr-output.cc, octave-value/ov-ch-mat.h, octave-value/ov-str-mat.cc: replace calls to charNDArray::matrix_value () with the charMatrix constructor.

--- a/libinterp/corefcn/pr-output.cc
+++ b/libinterp/corefcn/pr-output.cc
@@ -2842,7 +2842,7 @@
     {
     case 1:
     case 2:
-      octave_print_internal (os, nda.matrix_value (),
+      octave_print_internal (os, charMatrix (nda),
                              pr_as_read_syntax, extra_indent, pr_as_string);
       break;