Use doxygen to automate the generation of the documentation of imagingsuite

[vlocateli]

Add doxygen to automate the generation of the documentation of the imagingsuite. With doxygen, we can generate LaTeX files for documentation and also HTML pages.

I think doing like the warnings, opening an issue for the documentation is good so we can discuss about it.

What do you guys think? @anderskaestner @damskii9992

I thought of this because I need to read the code to add new reconstruction algorithms.

[anderskaestner]

I have done it in some parts of the code. See e.g. core/kipl/kipl/include/base/timage.h

Go ahead...

[anderskaestner]

I should also write a tutorial on how to write new modules in the wiki