operator<< for all PVField, indent and array_at manipulator

pvDataApp/factory/PVArray.cpp

@@ -97,4 +97,9 @@ PVArray::~PVArray()
     pImpl->capacity = capacity;
  }
 
+std::ostream& operator<<(format::array_at_internal const& manip, const PVArray& array)
+{
+	return array.dumpValue(manip.stream, manip.index);
+}
+
 }}