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Function uses options from drop-down list that have been selected by a
user to populate the appropriate observations and then draw the
appropriate chart

Add two new aggregation type strings. Now there a four supported
aggregation type strings

These functions wrap the logic of the two functions that calculate the
minimum or maximum observation values for an interval delimited by
calendar dates as well as delimited by calendar months

Calculate the minimum and maximum of observation values for a monthly
interval

Calculate the minimum and maximum of observation values for a daily
interval

It is assumed that this chart type will be used for visualizing
aggregated results