Harmonize electron count with charge
There is currently some inconsistency between with dimensions are used for denoting electrons. There are quantities which count electrons (dimensionless) and those that measure their (combined) charge. I suggest that we settle onto a single choice (to be determined), or allow for both when designing base classes.
The advantage of electron count is that it will remain consistent across unit systems (i.e. e- charge is unambiguously preferable). The downside is that in many cases, experimentalists will want to see charge in their favorite units.