Signed-off-by: David Rotermund <54365609+davrot@users.noreply.github.com>
\tau \frac{d}{dt}u=a\_{0} (u-u\_{rest}) (u-u\_{c})+RI
Default parameters: \tau=10 ms, a\_{0}=0.1 mV^{-1}, u\_{c} = -55 mV, u\_{rest} = -70 mV, R=10 M\Omega, I=2.2 nA, firing threshold u\_{thr}=-40 mV.
\tau=10
a\_{0}=0.1 mV^{-1}
u\_{c} = -55
u\_{rest} = -70
R=10 M\Omega
I=2.2 nA
u\_{thr}=-40 mV
