PURPOSE OF THE EXERCISE:
How to use advanced functionals (Hubbard U, hybrids, and Van der Waals)
for materials modelling.
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Description of examples:

* ex1.DFT+U/ -- Calculation of the projected density of states (PDOS) of FeO using DFT and DFT+U

* ex2.DFT+hybrids/ -- Calculation of the total energy of Si using DFT with PBE0 hybrid functional

* ex3.DFT+VdW/ -- DFT study of graphite using Van der Waals functionals
