keyword: (bugfix) only set changenode for kwtemplater when committing
kwexpand must always obtain changenode from filectx,
otherwise current changenode is expanded in every file.
Also fixes "hg cat <more than 1 file>".
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
pulling from ../a
searching for changes
adding changesets
adding manifests
adding file changes
added 2 changesets with 2 changes to 1 files
(run 'hg update' to get a working copy)
1 files updated, 0 files merged, 1 files removed, 0 files unresolved