Projects 16900,16904,16905,16906 (GPU, OpenMM21) to ADV

[sizhang]

Releasing new OpenMM21 projects to ADV

project number: 16900
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<stats-credit v="34700"/>

project number: 16904
<atoms v="32000"/>
<stats-credit v="22000"/>

project number: 16905
<atoms v="28000"/>
<stats-credit v="18500"/>

project number: 16906
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<stats-credit v="18100"/>

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<deadline v="7"/>
<k-factor v="0.75"/>

Projects description:
https://apps.foldingathome.org/project?p=16900