Several improvements for the stress tensor
Description
Several improvements for the stress tensor:
- Separate the contributions from the local and nonlocal part of the pseudopotential
- Use the correct range separation parameter for HGH pseudopotentials
- Move the pseudopotential contribution to the stress tensor to the correct place
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.