allow all chars in field names

src/factory/FieldCreateFactory.cpp

@@ -1299,6 +1299,17 @@ void validateFieldName(const std::string& n)
         msg<<"Field name \""<<n<<"\" must begin with A-Z, a-z, or '_'";
         throw std::invalid_argument(msg.str());
     }
+/*
+    size_t i = n.find_first_of("\"' ./");
+    if (i != std::string::npos)
+    {
+        std::cerr << "Warning: character '" << n[i] << "' ("
+            << (unsigned int)(unsigned char)n[i]
+            << ") in field name \"" << n
+            << "\" may have undesired side effects." << std::endl;
+    }
+*/
+/*
     for(size_t i=0, N=n.size(); i<N; i++)
     {
         char c = n[i];
@@ -1317,6 +1328,7 @@ void validateFieldName(const std::string& n)
             }
         }
     }
+*/
 }
 
 void validateFieldNames(const StringArray& l)