Changelog

✅ General Improvements

New convergence module with tools to collect, organize, and visualize convergence data from ab initio calculations.
Fermi-Dirac included as a possible smearing for all methods (along with Gaussian and Methfessel-Paxton).
Import times have been improved.

Energy decomposition of grep.total_energy now also works for fixed occuaption calculations and greps more energy components.
grep.kpointsEnergies also supports grepping orbital projections in non-relativistic calculations for Quantum Espresso.
New grepping tools for the convergence module:
- Added grep.cutoff to grep the cutoff energy used in calculations .
- Added grep.smearing to get smearings used in calculations.
- Added grep.runtime to get computational runtimes.
- Added grep.ram to get required RAM memory in calculations.
- Added grep.k_grid to get the k-grid used in calculations.
- Added grep.atomic_forces to grep atomic forces.

Include and implement a utils.fermidirac_kernel accross different utilities in order to get Fermi-Dirac statistics (along with Gaussian and Methfessel-Paxton).
Added eigen_projection, utility for projection an initial spectra onto an different spectra and optionally groups projections based on a set of eigenvalues.

Implement Fermi-Dirac smearing for the calculation of the Densities.
Now plot_fat and plot_color admit logaritmic scaling for projection weights.

The cell.Cell object now has a .view() method that allows to visualize the structure in 3D.