Attempt to reconnect if necessary

[pnorman]

When performing an incremental update I got the following error:

Traceback (most recent call last):
  File "./changesetmd.py", line 77, in <module>
    parser.parse(args.fileName)
  File "/usr/lib/python2.7/xml/sax/expatreader.py", line 107, in parse
    xmlreader.IncrementalParser.parse(self, source)
  File "/usr/lib/python2.7/xml/sax/xmlreader.py", line 123, in parse
    self.feed(buffer)
  File "/usr/lib/python2.7/xml/sax/expatreader.py", line 207, in feed
    self._parser.Parse(data, isFinal)
  File "/usr/lib/python2.7/xml/sax/expatreader.py", line 304, in end_element
    self._cont_handler.endElement(name)
  File "/home/pnorman/osm/changesets/ChangesetMD/changesethandler.py", line 55, in endElement
    self.changeset.numChanges, self.changeset.userName,self.tags))
psycopg2.OperationalError: server closed the connection unexpectedly
        This probably means the server terminated abnormally
        before or while processing the request.

postgresql may of restarted during the skipping stage but it would be nice to not need to re-skip

[pnorman]

okay with it as is