issue2551315 - Allow admin settable max number of rows to be returned by rest interface. Documented use of RestfulInstance.max_response_row_size to limit data returned from rest request.

try:
    # Python 3+
    from time import perf_counter
except (ImportError, AttributeError):
    # Python 2.5-2.7
    from time import clock as perf_counter  # noqa: F401