tests/test-merge5.out

convert: save hg revision during a convert

This breaks hg->hg hash roundtripping, but that was fragile, didn't work
reliably, and hence arguably of little value.

1 files updated, 0 files merged, 0 files removed, 0 files unresolved
removing b
abort: update spans branches, use 'hg merge' or 'hg update -C' to lose changes