Electroacpy

Can now be installed with pip through [PyPI](https://pypi.org/project/electroacPy/):
shell
pip install electroacPy

What's new

- updated documentation, now with point-sources, boundary conditions and a better description of evaluations,
- point-source simulation with BEM boundaries,
- acceleration data can be loaded with a numpy array (missing documentation at the time of release),
- directivity and impedance data can be exported as `*.frd` and `*.zma` (mainly for XSim4 support),
- fields and grids are now displayed as meshes in Gmsh, not as points.

Bug correction

- removed some remnant of PyOpenCL import. The code shouldn't crash if pyopencl is not installed,
- a few other things I don't remember.

Main changes
- import meshes as plotting grids with `.evaluation_plottingGrid(study, "path/to/custom_grid.msh")`,
- in-progress documentation now available at https://electroacpy.readthedocs.io/,
- improved way to assign surface impedance (still need to be documented),
- various bug fixes.

Notes
The module "generalToolbox" as been merged into the electroacPy module. You can access it through:
- `import electroacPy.general`, or
- `from electroacPy import gtb`.

From there, all functions should work as usual.

First public release. Documentation in progress.