Clean unused parameter warning

[anderskaestner]

Fix the unused parameter and unused set variable.

Unused variables (comment variables)

• [ ] tiffio

Unused parameters (use void myFunction(int /*unusedParam*/)-style)

• [ ] medianfilter
• [ ] draw
• [ ] Poisson noise (imagingsuite/core/kipl/kipl/src/math/PoissonNoise.cpp)

I have used std::ignore = unusedParam in the code, but it doesn't appear to be the ideal solution.

[anderskaestner]

This is a low-hanging fruit and will radically reduce the number of warnings. @vlocateli would you like to take care of this?

[vlocateli]

Yes. I can fix it.