[Feature Request] Anti-aliasing for plotted traces

[TomDeRybel]

What is the feature ?

Anti-aliasing for plotted data traces (for the bitmap back-end)

(Optional) Why this feature is useful and how people would use the feature ?

The plotted traces can look rather jagged at times (using the bitmap back-end). Anti-aliasing would increase the visual appeal of the generated plots.

(Optional) Additional Information

The included screenshot of a trace with rather steep slopes (and line width 2) shows the somewhat ragged appearance currently obtained.

[facorread]

See a related conversation in #128