Adding a subclass

To illustrate how to handle class hierarchies, we add a subclass: 
class HelloWorld2 : public HelloWorld
{
 public:
  void gets(double& s_) const;
};

void HelloWorld2:: gets(double& s_) const { s_ = s; }
i.e., we have a function with an output argument
Note: gets should return the value when called from Python
Files: HelloWorld2.h, HelloWorld2.cpp

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