BUG: Fix issue 2992: Crash when MRML nodes registered to a vtkMRMLIGTLCo...
requested to merge github/fork/tokjun/2992-crash-when-OpenIGTLinkIF-created-node-is-deleted into master
OpenIGTLinkIF module is updated to fix a issue reported in http://www.na-mic.org/Bug/view.php?id=2992
Junichi