Galpynostatic

- Fix the compilation of the OpenMP functions in `lib/map.cpp` by adding the `-lgomp` flag in the `setup.py`.

- Add new module `galpynostatic.simulation` that calulates galvanostatic maps from Frumkin or experimental isotherms, simulates isotherms at different Crates and fits equilibrium and non-equilibrium isotherms to obtain the diffusion coefficients and the kinetic rate constant.
- Add the `datasets.params` submodule with typical densities and specific capacities of lithium-ion battery electrode materials required for simulations.

- In the `bmxfc` metric, the argument `minutes` was changed to `c_rate`, like in the `make_prediction` module functions.

- Change the name of the metric `umbem` (thesis version) to `bmxfc` (paper version).

- Fix a bug in the shape of the return of `GetDischargeCapacities` in `preprocessing` module.
- Change the `if/else` condition in the `datasets` submodule by a `try/except` block.

- `base` and `utils` modules are now tested directly.
- Better docs of `datasets` submodule and the three functions replaced in only one. For each assert now there is a test.