[MERGE] Document code layout stuff

[Martin Pool]

This changes the developer guide to be more specific about how things should be
spaced/indented. 

There have been a few cases where reviewers have said "please do X" when pep8
doesn't (or doesn't clearly) require X.  abentley, lifeless and spiv said on
irc that they agree with these rules (if I've captured them accurately).
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