Improve statiliby of LDA+U tests
Description
The smearing was too large, making the tests unstable. This should improve the stability of some tests in the testsuite.
Changed 10-intersite.02
test to be on silicon instead of graphite.
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.
Edited by Micael Oliveira