Support for transferring element data during load balancing

See merge request !55

Remove more unused code

See merge request !56

Remove more unused code

See merge request !54

The check was already disabled by the `if (0)`.

Contrary to the documentation, `PointInElement` only returned the
values 0 (point not in element) and 1 (point in element).

This patch changes the return-type to `bool` and updates the
documentation to match the implementation.

Remove more unused code

See merge request !53

The script is no longer useful with the switch to CMake.