[DFTB-Plus-User] Electron density cube files

[MD Simulation]

Hi Balint,

It would be nice if you could write the electron density at a defined
number of timesteps.

Take a look at what NWChem does
https://nwchemgit.github.io/RT-TDDFT.html#visualization-sub-block-for-controlling-3d-visualization

It will automatically make cube files of electron density **differences**
so you can actually visualize the electron "movement" due to excitation.

I've used NWChem in the past to visualize photo-excited charge transfer;
showing how the electron density sloshes from one side to the next of a
molecule.

But, the problem with NWChem and using DFT, is it's painfully
slow....NWChem in general is painfully slow....

This would be a great addition to the ElectronDynamics module.

Thanks,
Frank
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