Scatter plot point size

[DaveTSG]

Checklist

• I am running the latest version of the card
• I checked if there isn't another feature request opened with the same request
• I checked that the feature is not already available in the dev branch

Is your feature request related to a problem? Please describe.
The scatter plots render quite large dots. This makes it hard to see subtle changes in high-frequency data as the dots can be too close and render over the top of each other, making it hard to see other nearby readings. It is also problematic with line graphs, although not as bad.

Describe the solution you'd like
It would be nice if we could change the size of the dots in a scatter plot, e.g. a dot that only takes up one pixel would be ideal. Making this user-definable would be great, but really, I don't mind if it's simply a 1px dot and that's the only option.
This would make it a lot easier to see slight changes in adjacent readings.