remove sb%latt from all the directories

Description

Remove sb%latt from all the files except the files in the directory "grids" and the file "ions/simul_box.F90", and replace it with "ions%latt" or "hm%ions%latt". If no "ions" or "hm" are present in the subroutines, an additional variable "latt" is introduced, and the relevant upper-level subroutines are also modified to include the variable. We can also trace back to a upper subroutine where "ions" or "hm" are present.

News snippet

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Checklist

• I have checked that my code follows the Octopus coding standards
• I have added tests for all the new features added in this request.