Update ndim::Point

Details:
- add Point::operator/(Point const&, double) -> Point const,
- add Point::operator{*, /}=(double) -> Point
- add corresponding tests
Add ndim::Constellation

Details:
- add class & tests
Update ConstellationBuilde & Constellation

Details:
- add correct implementation of removing of duplicate generating vectors (ConstellationBuilder)
- add iterators and [c]{begin, end}() methods (Constellation)
Integrate Constellation and ConstellationBuilder

Details:
- remove Constellation and ConstellationBuilder friendship
- add default Constellation ctor