Expand the `plot_3d_slicer` to other `vTypes` and `views`
Expand plot_3d_slicer
Addresses #116 .
Bug fix
First, it contains a minor bug-fix in the scrolling behavior (last element in each direction was not acceptable, only noticeable in small grids).
vType
Included all non-vector vType's: CC, Ex, Ey, Ez, Fx, Fy, Fz.
view
Included all view's except vec (real [default]; imag; abs; tested them all, seems to be fine).
Name-clash
There is a problem with the view-parameter, which I stupidly used to switch the x-y-axis. I changed the previous view-parameter to axis (hence axis='xy' or 'yx'). It is better to change this than to have different parameters as, for instance, in plotSlice. I added a switch for backwards-compatibility (if view in ['xy', 'yx'] => it sets axis = view; view = 'real').