Computation times

00:07.319 total execution time for 3 files from examples/models:

Example	Time	Mem (MB)
Nanduri et al. (2012): Amplitude and frequency are not interchangeable (plot_nanduri2012.py)	00:03.407	0.0
Granley et al. (2021): Pulse parameters shape phosphene appearance (plot_granley2021_biphasic.py)	00:02.343	0.0
Horsager et al. (2009): Temporal sensitivity of the epiretinal percept (plot_horsager2009.py)	00:01.569	0.0