Allow multiple people to have their work merged

[JustinSo1]

Subject of the issue

It would be beneficial to have more than 2 people simultaneously working on the grading. Currently, only 2 CSV files can be merged. It would be better if x CSV files can be merged

Expected behaviour

When running merge.csv, multiple CSV files can be given as input and output a singular merged CSV file with the appropriate columns merged

Actual behaviour

Only happens with 2 CSV files

[itsianmac]

@JustinSo1 See Michal's recent email on this. Has this been fixed/can be sorted so grades can be pushed ASAP?

[JustinSo1]

@itsianmac I'm confused, I don't see any recent email from Michael? Do you mind emailing me it? My most recent one is them saying it's all sorted out and that they don't need to rush grading.

I did adjust it to allow 2 people to work on it. This issue is an improvement on the current methods to allow >2 people to work on grading simultaneously