[MERGE] Improved review process docs and separate out architectural overview

[Martin Pool]

This improves the developer documentation following on from a few recent conversations.

There were some recommendations to use the (deprecated, I think) bundle and
merge-directive commands.  I changed them to just use bzr send.

There were two separate sections about the review process; I joined them.

I split out a separate developer document for the overview of main
classes.  (I think HACKING now covers so many different things and
different audiences it is unwieldy.)  This is heading towards adding there
a description of stacking.

There is some updated text on what we do during review.
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