Update permissions section Add Retire/Restore per class permissions. Move Register to web/email section. Reformat web/email permission list. including splitting the terms in the Rest Access/Web Access into two lines.

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