pgmanager: Add create_conn_listen() which should be used with wait_for_notify. Update wait_for_notify() to not use put_conn(). Add name to ConnectionInfo. Log queries before they are called. Log exceptions. Add notifyexample.

import sys

sys.path.insert(0, '..')


class Config(dict):
    def __init__(self, fname):
        data = open(fname).read()
        exec(data, dict(), self)