'Queries the active column (the old one if "archive" is set to True)
with the provided filter "flt", and returns a MongoDB cursor.
This should be very fast, as no operation is done (the cursor is only
returned). Next operations (e.g., .count(), enumeration, etc.) might
take a long time, depending on both the operations and the filter.
Any keyword argument other than "archive" is passed to the .find()
method of the Mongodb column object, without any validation (and might
have no effect if it is not expected).'

def get(self, flt, archive=False, **kargs):

    return self.set_limits(self.find((self.colname_oldhosts if archive else self.colname_hosts), flt, **kargs))
