libdatrwxx [WP]: use quotation marks to indicate function name

src/libs/libdatrwxx/error.h

@@ -148,7 +148,7 @@
 #define DATRW_warning(N,M) \
   { \
     std::ostringstream oss; \
-    oss << "in function " << N << "\n" << M; \
+    oss << "in function \"" << N << "\":\n" << M; \
     datrw::util::report_violation(datrw::util::Fwarning, \
                                   oss.str(), __FILE__, __LINE__, ""); \
   }