Changelog for QCoDeS 0.24.0

The March 2021 release of QCoDeS.

Breaking Changes:

Because the mode of the Infiniium instrument driver is no longer set in the constructor, the change introduced by 2837 is a breaking change.

Improved:

Support export to xarray for data with non unique indices (2848).
Update use of Slack API in qcodes.utils.slack.Slack class (2813)
Support dataset export to NetCDF or CSV after measurement ends (2782)
Export more metadata to xarray dataset (2854)
Extra explanation for Experiment and database in 15_minutes notebook (2838)

Improved drivers:

Remove hardcoded acquire mode and allow users to set acquire mode for trace on Infiniium driver (2837)
Updating SR830 driver with adding autorange method and its example notebook (2832)