infill overlap

[upsm]

At the moment Simplify3D allows for
- overlap between infill and perimeter
- overlap on infill inside small gaps only

What I'd like to see also is
- perimeter to perimeter overlap
- infill to infill overlap

The both new features should plot the path so that lines are closer together. At the moment it is easy to simulate this behavior by reducing the line width and increasing the extrusion multiplier. The problem with this approach is calculation (how much to decrease width and increase multiplier to get what percentage of overlap between lines) so adding a simple parameter would solve number of problems. Also having different infill to infill and perimeter to perimeter overlaps also helps great deal.

Reasoning behind this - simplest example where this is useful is overhangs, you want more overlap on overhangs so perimeter-perimeter overlap on overhangs could make them stronger and better looking.