maint: Deprecate is_numeric_type and replace with isnumeric. * ov.h (is_numeric_type): Use OCTAVE_DEPRECATED macro around function. * ov.h (isnumeric): New function. * make_int.cc, besselj.cc, cellfun.cc, data.cc, dot.cc, file-io.cc, graphics.cc, load-path.cc, lookup.cc, lu.cc, mex.cc, mgorth.cc, oct-hist.cc, pr-output.cc, schur.cc, sparse.cc, sqrtm.cc, sub2ind.cc, typecast.cc, utils.cc, chol.cc, qr.cc, ov-base-diag.h, ov-base-mat.h, ov-base-scalar.h, ov-base-sparse.h, ov-base.cc, ov-base.h, ov-bool-mat.cc, ov-bool-mat.h, ov-bool-sparse.h, ov-bool.h, ov-cell.h, ov-class.cc, ov-fcn-inline.cc, ov-lazy-idx.h, ov-perm.h, ov-range.h, ov-str-mat.h, ov-usr-fcn.cc, bp-table.cc: Replace instances of is_numeric_type with isnumeric.

--- a/libinterp/corefcn/mgorth.cc	Tue Jun 13 09:52:59 2017 -0700
+++ b/libinterp/corefcn/mgorth.cc	Tue Jun 13 10:20:55 2017 -0700
@@ -78,7 +78,7 @@
     error ("mgorth: V should be a matrix, and X a column vector with"
            " the same number of rows as V.");
 
-  if (! arg_x.is_numeric_type () && ! arg_v.is_numeric_type ())
+  if (! arg_x.isnumeric () && ! arg_v.isnumeric ())
     error ("mgorth: X and V must be numeric");
 
   octave_value_list retval;