templatekw: make {rev} return wdirrev instead of None...
templatekw: make {rev} return wdirrev instead of None
wdirrev/wdirnode identifiers are still experimental, but {node} is mapped to
wdirnode. So {rev} should do the same for consistency.
I'm not sure if templatekw can import scmutil. If not, we should move intrev()
to node module.
