demandimport: ignore pwd and grp.
Both are unavailable under Windows and tarfile detects them via ImportError.
#!/bin/sh
hg init
echo a > a
hg ci -Ama -d'0 0'
mkdir b
echo a > b/a
hg ci -Amb -d'1 0'
hg manifest
hg manifest -v
hg manifest --debug
hg manifest -r 0
hg manifest -r 1
hg manifest -r tip
echo % should fail
hg manifest -r 2
hg manifest -r tip tip
hg manifest tip