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<P>Contains class for implementing a linear-boolean update function, defined as
    follows.

<P>Gi:L0 = Gi:L1(1 - rate) + Li(parents(Gi:L0)/Gi:L1) * Fi(parents(Gi:L0)/Gi:L1)
    + ei,</P>

<P>where Li is a linear function of the causal parents of a gene i from previous
    time steps, F is a Boolean function of the causal parents of gene i from
    previous
    time steps returning +1 or -1, ei is an error term chosen from N(0, s.d.),
    and
    rate is a constant governing how quickly expression levels return to
    zero.</P>
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