[brisbane-core/MERGE] fix create_by_apply_delta() when rename+modify in same delta

[ian.clatworthy at internode.on.net]

Yet another create_by_apply_delta() fix. A good inventory delta was generating
a bad chkmap delta for the parent_id_basename_to_file_id CHKMap. I think
it's worth refactoring create_by_apply_delta() so that the conversion from
an inventory delta to chkmap deltas can be separately tested. That can come
later though, as can a pile of tests for the many scenarios.

Together with the earlier brisbane-core fixes I posted, this lets my
yet-to-be-released version of fastimport work on repository formats
supporting CHKInventories, at least for simple import streams. Hooray.
I wonder if they have also fixed the upgrade issues I was having?
I'll test that tomorrow.

Ian C.

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