Merge branch 'feature/documentation' into develop

CMakeLists.txt

README.rst

cmake/FindSphinx.cmake

cpp/kspace.cpp

cpp/mainpage.dox

documentation/Makefile

documentation/bandpass/notes0.txt

documentation/chapters/README.rst

documentation/chapters/api.rst

documentation/chapters/bandpass.rst

documentation/chapters/cpp.rst

documentation/chapters/cpp_doxygen.rst

documentation/chapters/development.rst

documentation/chapters/overview.rst

documentation/conf.py.in

documentation/cpp/cpp_config

documentation/index.rst