hgweb: use a single-element tuple to return from protocol.unbundle()
Python 2.3/2.4 don't support yielding from inside try/finally blocks.
#!/bin/sh
hg init dir
cd dir
echo bleh > bar
hg add bar
hg ci -m 'add bar'
hg cp bar foo
echo >> bar
hg ci -m 'cp bar foo; change bar'
hg debugrename foo
hg debugindex .hg/store/data/bar.i