Finished normalization of the gas constants

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>

src/Backends/Helmholtz/Configuration.cpp

@@ -0,0 +1,42 @@
+#include "Configuration.h"
+
+namespace CoolProp
+{
+//
+//Configuration::Configuration()
+//{
+//}
+//
+//Configuration::~Configuration()
+//{
+//}
+
+bool get_config_bool(configuration_keys key)
+{
+    switch(key)
+    {
+        case NORMALIZE_GAS_CONSTANTS:
+            return true;
+        default:
+            throw ValueError(format("%d is invalid key to get_config_bool",key));
+    }
+}
+double get_config_double(configuration_keys key)
+{
+    switch(key)
+    {
+        default:
+            throw ValueError(format("%d is invalid key to get_config_double",key));
+    }
+}
+std::string get_config_string(configuration_keys key)
+{
+    switch(key)
+    {
+        default:
+            throw ValueError(format("%d is invalid key to get_config_string",key));
+    }
+}
+
+}
+