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We were using the original VL observations array in the 'map' array
method. Updated to use the final version of VL observations array

Update logic for drop-down list

Deactivate 'draw chart' button during async task. In addition, improve 
legibilty by replacing multiple if's with 'case' statement

See merge request !18

Update logic for drop-down list

Tweak logic so that custom error messages are thrown before performing 
async tasks i.e. fetching observations and metadata

See merge request !17

Confirm that the selected drop-dowwn options are valid before fetching
the observations

Create a full title for line and column charts.

Ensure that title contains all the selected data points when
aggregation is selected. Before this fix, only the first data point
was included

Update logic for drop-down list

Improve processing logic for drop-down list (draw the appropriate 
chart based on selected options)

See merge request !16

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

Update logic for drop-down list

Improve processing logic (non-GUI related) for drop-down list

See merge request !15

Update dynamic drop-down list

Improvements to dynamic drop-down list

See merge request !14

Update dynamic dropdown list

Add functionality for selecting multiple options from a dropdown list

See merge request !13

Add functionality to calculate min / max

Add logic for calculating the minimum and maximum observation values

See merge request !12

Plot line charts using daily minimum and monthly maximum values

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

Handling of raw vs aggregated data

Introduce logic that determines how to deal with raw vs aggregated 
data when drawing line charts and column charts

See merge request !11

Update column chart

Refine column chart drawing logic

See merge request !10

Update scatter plot chart

Scatter plot now supports visualization of more than two phenomena

See merge request !9

Add functionality to calculate average of observations

Add logic for calculating the average (arithmetic mean) of observations

See merge request !8

Add functionality to draw multi-series column chart

See merge request !7

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

Improve logic for performing basic aggregation

See merge request !6

Add functionality to draw multi-series line chart

See merge request !5

Add logic for performing basic aggregation

See merge request !4

Update scatter plot chart

Further improvements to logic for drawing scatter plot chart

See merge request !3

Update scatter plot chart

Improve logic for drawing scatter plot chart

See merge request !2

- Move the function within the module file

- Add documentation to the function