into Point3d header file.

... into TemplatePoint header file.

The std::pow call is very expensive.

Reduces number of implicit type narrows.

Wrong parameter names.
Empty statements.
Unify comment style. /* */ vs ///

There is no recovery from the error anyway:
Assertion in debug mode will show this.
ERR in release mode.

Point3d is the base of all OGS point classes.

Using the removed constructor was insecure because there was neither a
compile time check nor a run time check if the size of the C array holds
enough data.

This improves GeoLib::SearchNearestPoints() by factor >1.4.

In particular use shift operation.

extend DenseMatrix to support several Eigen matrix functions: data(), size(), transposeInPlace(), setIdentity()