[#3399]Make xlsx files. Sort the surveys by path.

[stellanl]

Before the PR (what is the issue or what needed to be done)

Files are named .xlsx, but are in xls format. Long unsorted lists are hard to interpret.

The solution

Use xlsx-generating POI classes. Sort the surveys by path.

Screenshots (if appropriate)

Reviewer Checklist

• Added an explanation about the work done
• Connected the PR and the issue on Zenhub
• Added a test plan to the issue
• Updated the copyright header (when relevant)
• Formatted the code
• Added a documentation (if relevant)
• Added some unit tests (if relevant)