[merge] doc: coding standards for repr methods

[Martin Pool]

Patch says it all, I think.  I have been doing this in some places and
think it is very useful.

I haven't updated all the existing classes; it would be nice to do so
if someone feels like it.  I would encourage people to check this in
reviews in future.

I've also rearranged 'coding standards' into a top-level section, and
this patch has some leftover previously approved stuff about PPAs that
has not merged yet, and also fixes a broken hyperlink and recommends
the deprecated_in() function.

-- 
Martin <http://launchpad.net/~mbp/>
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