Closing issues

[LouisDeconinck]

Quite some issues have been resolved, but stay open. It would be nice if you (@SouravRoy-ETL) could close issues that have been fully handled and haven't received any updates in a while. This makes it easier to spot which issues still need some work.

At a quick glance I feel all of these issues can be closed: #1, #3, #6, #9, #10, #26, #31, #34, #75, #91, #98, #100, #106, #111, #129, #131, #133, #137, #142, #143, #156, #157, #161, #164, #166, #170, #182, #183, #185, #204, #214, #223, #228, #238, #241