Previously using inexact predicates would yield ambiguous results whether a point
is inside or outside of a projected element, depending on compiler and architecture.

The exact predicates are slower, so one could think about to add a run-time flag to
use exact or inexact predicates giving the user an option for fast or correct calculations.

Rename Point3d::getCoords() -> Point3d::data() and WeightedPoint::getCoords() -> WeightedPoint::data().

This simplifies most of the code.

This needs some changes in other files, too.

Fixes multiple copyright messages in the doxygen docu.

ag '\\file' -L --ignore=ThirdParty *Lib |xargs  sed -i 's/\(.*\)\\copyright/\1\\file\n\1\\copyright/'