We are circumventing a bug of the Intel Fortran compiler. This was
tested with both ifx `2023.1.0` and ifort `2021.9.0`. The bug occurs
on return from procedure `set_max_speed`: `free(): double free
detected in tcache 2` and crashes execution. The bug is revealed in
commit cc13fd5b. The GNU compiler does not have this bug.

To circumvent the Intel compiler bug, instead of an ssh component of
`cont_list_proj`, we have to use a separate array:
`cont_list_ssh`. This is maybe for the best because the component
`area` of `cont_list_proj` was not defined.