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BUG: Vasp SMASS should be a float

username-removed-282459 requested to merge ajjackson/ase:vasp-smass into master

Positive fractional values of SMASS are used to control damped MD optimisations. As far as I can tell there isn't any harm done by expressing the negative integer "flag" values as floating-point numbers; when they are expressed as integers in the INCAR they are still printed with a few decimal zeroes in the OUTCAR.

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