The result are valid queries of chains with name '_'.

Fixes the error "ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()" in AddMesh.

Atoms that do not actually exist are still added in deep view. The problem is
that they're added at position (9999.99, 9999.99, 9999.99). Internally we use
a grid of equally sized cubes to efficiently lookup up positions closeby.
Extreme locations lead to an extremely large grid with most of the cubes being
unoccupied. The simple solution here is to just increase the size of the
cubes. The larger the cubes, the slower the code. However, in real world
scenarios their size won't be inreased.

hasn't been used/tested for years

The required functionality has been removed in commit:
41ba5333