- get number of periodic layers
- calculate size of xout and yout

1 to 1 correspondence of formulas to literature.

boson part to be done.

to be tested

- do not multiply with ε∞ (Lambin version of ωp)
- correct the index for more than one layer
- extended Drude not tested yet.

Still linker errors.

update logging after working on tests/SetEpsTestCasesFromScratch/f90/doeels.f90