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`AddNodeLink` used to cache the linked node whereas `AddNodeLinkClean`
did not, however, at some point the former was changed to do the same
thing as the latter (i.e., not cache the linked node). That is, they now
do the same thing so there's no reason to have both.

The name `AddNodeLink` is preserved, even though it used to imply the
cache functionality contrasting with the `Clean` suffix of
`AddNodeLinkClean`, with this function removed the cache connotation
doesn't hold anymore.

License: MIT
Signed-off-by: Lucas Molas <schomatis@gmail.com>