Add C++ of balanced binary tree butterfly factorization + C++ tests.

misc/test/CMakeLists.txt

misc/test/src/C++/hierarchicalFactorizationButterfly.cpp.in

...src/C++/hierarchicalFactorizationButterflyBalanced.cpp.in

src/algorithm/factorization/faust_butterfly.h

src/algorithm/factorization/faust_butterfly.hpp