Add more contiguous statements

Description

Starting with version 9, gfortran seems to make temporary copies in places it did not before. Thus, more contiguous statements are need in the plaves where batch_init or wfs_elec_init is called with an array argument to make sure that the pointer in the batch is not pointing to a temporary array, but to the real data and that the real data is then modified.

News snippet

Fix contiguous statements for newer gfortran versions

Checklist

• I have checked that my code follows the Octopus coding standards