ENH: Restore removed RegisterIncomingMRMLNode function

Some extensions still used the RegisterIncomingMRMLNode(vtkMRMLNode*) signature.
Restored so that those extensions can keep working.

OpenIGTLinkIF/MRML/vtkMRMLIGTLConnectorNode.cxx

@@ -619,7 +619,7 @@ void vtkMRMLIGTLConnectorNode::vtkInternal::ProcessIncomingDeviceModifiedEvent(
 
   this->IncomingNodeClientIDMap[modifiedNode->GetName()] = modifiedDevice->GetClientID();
   modifiedNode->EndModify(wasModifyingNode);
-  
+
   if(isNewNodeCreated)
   {
      //New device event needs to be forward with the MRMLNode to other objects, such as openigtlinkRemote. where the node will be processed to set name accordingly.
@@ -1879,6 +1879,43 @@ void vtkMRMLIGTLConnectorNode::OnNodeReferenceModified(vtkMRMLNodeReference* ref
   }
 }
 
+//---------------------------------------------------------------------------
+bool vtkMRMLIGTLConnectorNode::RegisterIncomingMRMLNode(vtkMRMLNode* node)
+{
+  if (!node)
+  {
+    vtkErrorMacro("Error registering incoming node. Incoming node is NULL");
+    return false;
+  }
+
+  if (!node->GetScene())
+  {
+    vtkErrorMacro("Error registering incoming node. Node scene is NULL");
+    return false;
+  }
+
+  igtlioDevicePointer device = NULL;
+  igtlioDeviceKeyType key;
+  key.name = node->GetName();
+  std::vector<std::string> deviceTypes = this->GetDeviceTypeFromMRMLNodeType(node->GetNodeTagName());
+  for (size_t typeIndex = 0; typeIndex < deviceTypes.size(); typeIndex++)
+  {
+    key.type = deviceTypes[typeIndex];
+    device = this->Internal->IOConnector->GetDevice(key);
+    if (device != NULL)
+    {
+      break;
+    }
+  }
+
+  if (device == NULL)
+  {
+    device = this->Internal->IOConnector->GetDeviceFactory()->create(key.type, key.name);
+  }
+
+  return this->RegisterIncomingMRMLNode(node, device);;
+}
+
 //---------------------------------------------------------------------------
 bool vtkMRMLIGTLConnectorNode::RegisterIncomingMRMLNode(vtkMRMLNode* node, IGTLDevicePointer device)
 {

OpenIGTLinkIF/MRML/vtkMRMLIGTLConnectorNode.h

@@ -166,6 +166,7 @@ class VTK_SLICER_OPENIGTLINKIF_MODULE_MRML_EXPORT vtkMRMLIGTLConnectorNode : pub
   // Description:
   // Register MRML node for incoming data.
   // Returns true on success.
+  bool RegisterIncomingMRMLNode(vtkMRMLNode* node);
   bool RegisterIncomingMRMLNode(vtkMRMLNode* node, IGTLDevicePointer device);
 
   // Description: