Fix HoppingMatrix with new schema

[JosePizarro3]

I added HoppingMatrix and CrystalFieldSplitting properties, as well as WignerSeitz as a variable.

@JFRudzinski @Bernadette-Mohr @ndaelman-hu please, note that rank, in order for setting the dynamic shape of value requires to have some quantities already define during instantiation of the class. In this example of HoppingMatrix, rank=[self.n_orbitals, self.n_orbitals], hence we need to instantiate during parsing/normalizing like hopping_matrix = HoppingMatrix(n_orbitals=4).

I still need to:

• Add testing here
• Add normalization in HoppingMatrix to extract other physical properties (like DOS, bands, Fermi surfaces) --> TODO in another branch with the help of @mohammadnakhaee

Closes #60

[JosePizarro3]

I will merge this (just a simple definition with dummy testing) and work on #52 . Then I will revisit the fact that from HoppingMatrix we can generate electronic structure properties (DOS, ElectronicEigenvalues, ElectronicBandGap, etc).

[coveralls]

Pull Request Test Coverage Report for Build 8896720689

Details

• 17 of 17 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.05%) to 98.22%

---

Totals
Change from base Build 8877524170:	0.05%
Covered Lines:	607
Relevant Lines:	618

---

💛 - Coveralls