Improve CoverageSimplifier

[dr-jts]

Improves CoverageSimplier:

• Adds small ring removal, with configurable tolerance factor
• Adds smoothness weighting, to provide smoother results
• Adds ability to specify separate tolerances for inner and outer edges
• Adds support for a separate tolerance for each input coverage element

[nstrahl]

There was an error where only one tolerance was considered for each coverage edge

[nstrahl]

int index1 = covEdge.getAdjacentIndex(1);

[dr-jts]

Good catch. Need a unit test to verify that.

[nstrahl]

I have a suggestion here.

Take the geometry from example testInnerHoleTouchingShell.

If the tolerances 0,500,500 are provided then the holes are not simplified. I think it should be possible to coarsen hole or island polygons since they do not have any significant overlap with the exterior ring of the geometry enclosing them. Therefore we should probably skip the tolerance comparisson in such a case. A flag could be passed (e.g. forceHoleTolerances) to make this optional.