use namespace for lo-mappers.h functions * lo-mappers.h, lo-mappers.cc (acos, arg, asin, atan, ceil, conj, copysign, exp2, finite, fix, floor, imag, is_NA, is_NaN_or_NA, isinf, isinteger, isnan, log2, max, min, mod, negative_sign, nint, nint_big, positive_sign, rc_acos, rc_acosh, rc_asin, rc_atanh, rc_log, rc_log10, rc_log2, rc_sqrt, real, rem, round, roundb, signbit, signum, trunc, x_nint): Define in octave::math namespace. Deprecate old names. Change all uses. * oct-inttypes.h: Put round and isnan functions in octave::math namespace and rename from xround and xisnan. Change all uses.

--- a/libinterp/operators/op-fcs-fcs.cc	Fri May 27 10:20:48 2016 -0400
+++ b/libinterp/operators/op-fcs-fcs.cc	Wed May 25 16:51:16 2016 -0400
@@ -42,7 +42,7 @@
 {
   const octave_float_complex& v = dynamic_cast<const octave_float_complex&> (a);
   FloatComplex x = v.float_complex_value ();
-  if (xisnan (x))
+  if (octave::math::isnan (x))
     err_nan_to_logical_conversion ();
 
   return octave_value (x == 0.0f);