Add support for vector of points

[vgvassilev]

Support double f(double*, unsigned numElements); The user should be able to specify the independent variable from a given array of variables.

[alexander-penev]

Also: double f(Vec v);

where Vec is structure or class for example:

struct Vec { double x, y, z; //... }

[vgvassilev]

Add tests such as:

double f1(double* pts, size_t numElements) {...}
double f2(std::vector<double> pts) {...}
double f3(iterator begin, iterator end) {...}