…alysis

BREAKING CHANGE: technically an API change.

BREAKING CHANGE: since it changes API

…analysis

…l densities

…ensities

TODO: plotting of ion channels where channel densities are grouped

…le valued

to handle deprecation warning:

```
PlotMorphology.py:784:
MatplotlibDeprecationWarning: Unable to determine Axes to steal space
for Colorbar. Using gca(), but will raise in the future. Either provide
the *cax* argument to use as the Axes for the Colorbar, provide the *ax*
argument to steal space from it, or add *mappable* to an Axes.
fig.colorbar()
```

…analysis

…analysis

…-analysis

…analysis

Just needed to replace it with sympy's `Heaviside` function:

Reference:
https://docs.sympy.org/latest/modules/functions/special.html#sympy.functions.special.delta_functions.Heaviside