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FIX RRR bug wrt offsets, allow python 2.3 to run pgloader when it does not need collections.deque (no Round Robin Reader), and prepare packaging for 2.3.2

# Author: Dimitri Fontaine <dim@tapoueh.org>
#
# pgloader librairies

import collections

class RRReader(collections.deque):
    """ Round Robin reader, which are collections.deque with a
    readlines() method"""

    def readlines(self):
        """ return next line from queue """
        while 1:
            try:
                yield self.popleft()
            except IndexError:
                return