reduce getting of planets
reduce getting of planets

Make CSector::GetPlanet private; no more modifications of planets
outside of CSector possible.
remove useless derivation of CSystem and CSector from CObject

This is only needed in case we'd use << var or >> var with var
allocated via CSector*/CSystem* var = new CSystem()/CSector()
add copy constructor to CAnomaly to fix erroneous handling of anomaly member in CSector

The copy constructor wasn't doing anything and the assignment operator
made a shallow copy.
cppcheck: initialize member
cppcheck: make functions const or static
cppcheck: correct initialization order in some classes