Update triton, He3 and alpha mass to CODATA values

Hendrik Jage requested to merge hjage_IonMasses into dt-2018

The current mass values for triton, He3 and alpha - as well as their anti-particles - are outdated.

This MR would change them to the latest CODATA values, see triton, He3, and alpha.

Probably these changes should also be propagated to all data types.

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