improved async support in psycopg python2 branch

Hi *,

I just merged and pushed almost all of Jan's changes into the official
python2 branch of psycopg. All tests still pass and Jan changes
_simplified_ somehow some internal paths so I am quite confident that th
next release won't break anything but I'd like to have as many people as
possible test the current release candidate tarball:

http://initd.org/pub/software/psycopg/psycopg2-2.2.0rc1.tar.gz
http://initd.org/pub/software/psycopg/psycopg2-2.2.0rc1.tar.gz.asc

I said "almost all" because I did some little fixes here and there,
especially to make it possible to call .poll() outside of the
asynchronous context. This is necessary for NOTIFYs to work.

Jan, please review by changes, especially moving POLL_OK from 3 to 0 to
mimic old isready() usage. Also, let's start telling Twisted people they
don't need an extra thread for psycopg anymore. :)

federico

-- 
Federico Di Gregorio                                       fog-NGVKUo/i/[email protected]
 Come sai se il primo è ben dato? In realtà è "Beh il secondo bacio ben
  dato non si rifiuta".                                    -- Alessandra

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