index: make most "nt_*" functions take a nodetree...
index: make most "nt_*" functions take a nodetree
Now that the nodetree has a pointer to the index, we can pass the
nodtree instead of the index. There are few "nt_*" functions left
after this. I'll deal with them soon.
Differential Revision:
https://phab.mercurial-scm.org/D4113
