nxtraverse dependent only in C API

[pedro-vicente]

Can anyone enable write permissions for me?
I would like to push a change in CMakeLists.txt, nxtraverse depends only in the NeXus C API

[zjttoefs]

Thanks for getting in touch! For a single change a pull request may be more adequate, though. Please fire away!

[pedro-vicente]

ok, it's here
#454