Union of polygons using a CDT

[sloriot]

Summary of Changes

Union of polygons using a 2D CDT

Release Management

• Affected package(s):
• Feature/Small Feature (if any):
• Link to compiled documentation (obligatory for small feature) wrong link name to be changed
• License and copyright ownership:

[sloriot]

@afabri I simply copied/pasted the header. It should be updated to be properly included and a small feature should be done.

[sloriot]

@afabri now that Polygon_repair is merged into master, you probably want to move the header into the package and add a new repair method based on the union.