[WIP] NFS 4 Support
This PR introduces NFS v4 support alongside the existing NFS v3. This is handled seamlessly using the nfs://
links. NFS v4 support is detected using the low level functions in libnfs, and is used by default. If NFS v4 is not detected on the server then the mount proceeds in NFS v3 mode. Fixes #18.
Edited by Max Ehrlich