Added Export Bonner Spreadsheet Features

[WackyWeaver]

Issue Description

Fixes #1378

• "We need more Bonner Cohort export options, to see the currently selected cohort, the last 5 years, and the current All. These spreadsheets should also show all of the bonner events and their attendees. Add columns to the sheet for each event with at least one attendee in the spreadsheet"

Changes

• Created buttons associated with the new custom spreadsheets

• Before
  

• After
  

• Also, created an Ajax function to associate each button to a specific flask route. We pass a start year and end year into the route using a values stored in the URL request. Then, if we want to additionally change the spreadsheet range, we can simply express a different range of values for the flask route function.

• We also wrote into the bonner spreadsheet the status of each bonner requirement. If it was completed by the cohort member, we include the date of completion. If it is incomplete, we simply write "incomplete in the column of a given bonner member row.
  

• Lastly, we wrote an mySQL script to migrate the Requirementmatch table data. Since much of the Event table data did not insert the bonner requirement events into the proper requirement table, we created a script to migrate all bonner events that include the select names of a given Bonner requirement.

Testing

• Use git checkout 1378-cohort-export
• flask run
• create a Bonner event and add a specified Bonner requirement within the drop down.
• create a Bonner event with a given Bonner requirement name separate from the other specific requirement (simply to show two different Bonner events (e.i. make a Sophomore exchange and All Bonner Meeting))

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[stevensonmichel]

Some comments might be useful here.