Draft PR for standardizing salinity values and units#13

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realmarcin wants to merge 3 commits intomicrobiomedata:mainfrom

realmarcin:main

Commits on Aug 5, 2021

added salinity summary test over all values, first steps
realmarcin
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Commits on Aug 7, 2021

test and data for all unique salinity values from previous version of
realmarcin
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Commits on Sep 14, 2021

test nb
realmarcin
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