Ovsepian et al. 2013 CN neuron model

Latest NEURON code for the CN neuron model. This code was used for the
simulations shown in Figure 9 of Ovsepian et al. (2013).

Saak V Ovsepian, Volker Steuber, Marie Le Berre, Liam O'Hara, Valerie B
O'Leary, and J. Oliver Dolly (2013). A Defined Heteromeric KV1 Channel
Stabilizes the Intrinsic Pacemaking and Regulates the Efferent Code of
Deep Cerebellar Nuclear Neurons to Thalamic Targets. Journal of
Physiology (epub ahead of print)