Shared boundary weights across domains

[iyerkrithika21]

Options to enable shared boundary and set the weighting across domains in studio. Currently hardcoded here.

• This controls the distribution of the particles around the shared boundary and contour.
• The default might result in a small band around the shared boundary with no particles.
• Need to investigate how important is the weighting
• How does it affect real data, and how to tune it for real data intuitively?