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Add functionality to specify query types for each tag rather than for the whole data pull. #19

@huskerdrew

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@huskerdrew

At times it is necessary to query some tags as a snapshot or interpolated values (non-numeric responses) while the rest of the tags in the data table would be mathematical function queries like average, standard deviation etc. This creates an issue with alignment of the data table but potentially 1 tag could be chosen to be the row identifier tag and then other queries could be relevant to that. Example: I have a lab sample that returns every two hours. I want to pull all archived values on that tag and I denote it as my row identifier. That establishes the time column for the entire table. I then have other numerical tags that I want to have 1 hour averages of so it takes a 1 hour average from 1 hour before the lab sample timestamp to the timestamp. I might have some tags that are snapshot values like a pump status and it simply takes that snapshot at the lab sample timestamp. In this way the table is aligned based on that identified lab sample timestamp but you can query each tag in its own individual way.

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