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Utilities for handling RFC1982 Serial Number Arithmetic.

@see: U{http://tools.ietf.org/html/rfc1982}

@var RFC4034_TIME_FORMAT: RRSIG Time field presentation format. The Signature
   Expiration Time and Inception Time field values MUST be represented either
   as an unsigned decimal integer indicating seconds since 1 January 1970
   00:00:00 UTC, or in the form YYYYMMDDHHmmSS in UTC. See U{RRSIG Presentation
   Format<https://tools.ietf.org/html/rfc4034#section-3.2>}
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    An RFC1982 Serial Number.

    This class implements RFC1982 DNS Serial Number Arithmetic.

    SNA is used in DNS and specifically in DNSSEC as defined in RFC4034 in the
    DNSSEC Signature Expiration and Inception Fields.

    @see: U{https://tools.ietf.org/html/rfc1982}
    @see: U{https://tools.ietf.org/html/rfc4034}

    @ivar _serialBits: See C{serialBits} of L{__init__}.
    @ivar _number: See C{number} of L{__init__}.
    @ivar _modulo: The value at which wrapping will occur.
    @ivar _halfRing: Half C{_modulo}. If another L{SerialNumber} value is larger
        than this, it would lead to a wrapped value which is larger than the
        first and comparisons are therefore ambiguous.
    @ivar _maxAdd: Half C{_modulo} plus 1. If another L{SerialNumber} value is
        larger than this, it would lead to a wrapped value which is larger than
        the first. Comparisons with the original value would therefore be
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        Construct an L{SerialNumber} instance.

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        @type number: L{int}

        @param serialBits: The size of the serial number space. The power of two
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            to a serial number value.
        @type serialBits: L{int}
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        Check that a foreign object is suitable for use in the comparison or
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        @return: C{other} after compatibility checks and possible coercion.
        @raises: L{TypeError} if C{other} is not compatible.
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        result of such an addition, s', is defined as

        s' = (s + n) modulo (2 ^ SERIAL_BITS)

        where the addition and modulus operations here act upon values that are
        non-negative values of unbounded size in the usual ways of integer
        arithmetic.

        Addition of a value outside the range
        [0 .. (2^(SERIAL_BITS - 1) - 1)] is undefined.

        @see: U{http://tools.ietf.org/html/rfc1982#section-3.1}

        @type other: L{SerialNumber}
        @rtype: L{SerialNumber}
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        Create an L{SerialNumber} instance from a date string in format
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        3.2<https://tools.ietf.org/html/rfc4034#section-3.2>}.

        The L{SerialNumber} instance stores the date as a 32bit UNIX timestamp.

        @see: U{https://tools.ietf.org/html/rfc4034#section-3.1.5}

        @param utcDateString: A UTC date/time string of format I{YYMMDDhhmmss}
            which will be converted to seconds since the UNIX epoch.
        @type utcDateString: L{unicode}

        @return: An L{SerialNumber} instance containing the supplied date as a
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