Update atomic masses in share/pseudopotentials/elements

Description

Update atomic masses by removing the uncertainty that had been included as an extra digit.

News snippet

Update atomic masses in share/pseudopotentials/elements

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.

Closes #53 (closed)

changed milestone to %10.0

added Bug label

approved this merge request

assigned to @nicolastd

added 1 commit

• e89f740d - Update reference values for test.

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approved this merge request

mentioned in commit f8d29542

merged

added Bugfix in Changelog labels