unit scaling

[dmeliza]

Units aren't being scaled correctly by to_array. For example, if capacitance is entered in the yml file as nF or pF, the units are ignored. But for dV/dt to have the right units of mV/ms, the capacitance has to be corrected to pF.

[dmeliza]

This isn't trivial to fix. It's simple enough to convert all the parameters to base units. This doesn't affect the magnitude of dV/dt, but it does affect all the state derivatives because they're in ms^-1. For now, users need to be careful to enter compatible units.