Revert "Further optimization of CPU neighbor list (if storage_mode == half)"
Revert "Further optimization of CPU neighbor list (if storage_mode == half)"

This reverts commit adf333a8865d9e166160310255b1740cae69526f.

joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue