[MERGE][bug #300177] Pass compression_parent as part of 'get_record_stream'

[John Arbash Meinel]

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The attached patch does 2 basic things:

1) Changes the api so that the records (ContentFactory objects) from
get_record_stream have a member called "compression_parents".

2) Change insert_record_stream to use the compression_parents field, and
take appropriate action.


I went for the plural form, because it doesn't require a code change if
we ever do multi-parent deltas.

At the moment, pack format repositories could actually handle a delta
which does not point at the left-hand parent. You can get this via "bzr
reconcile" after the per-file graph was a bit wonky (we had this in
older versions of bzr).

I originally was planning on changing insert_record_stream() to preserve
the fact that it was a non left-hand-parent. However, that required a
lot of updates, and means that the repository wouldn't be compatible
with older clients. So rather than spend a lot of time getting that
working, I just punted and always extract to a fulltext and re-insert.

John
=:->
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