Generate PDFs from the PI-specific invoices

[QuanMPhm]

To help automate billing, in addition to exporting the PI-specific CSVs, the processing script should also generate PDFs for them. Based on the PDFs we are currently sending out to PIs, the only additional steps needed to turn the PI-specific CSVs into PDFs are:

• Appending of a row summing up the following numbers:
  • Cost
  • Credit
  • Balance
• Naming convention for the PDFs are: ".pdf"

Examples can be found in our billing PDFs.

Based on our prepaid scaffolding document, it seems we may want to update the naming for these PI-specific PDFs after implementing prepaid group billing.

@knikolla @naved001 @joachimweyl I believe this can be solved fairly simply with any python PDF-exporting package. Let me know if there is anything else I should be aware of before starting work on this issue.

[joachimweyl]

A sample PDF might help the last 4 sheets here are demo PDFs.