More bench fix and adaptation
perms and permsn for combinatorial
updatung doc/infos/elementary_math.txt
cleaning includes in perms ans permsn
unwrap signal
normalizing license header in all C++ files
updating signal/unit/scalar/CMakeLists.txt
forgotten unwrap.cpp
new header style for unwrap.cpp
cross product
more standardized license headers
Merge branch 'master' into integre
adding some tests and dispatch for if_one_else_zero and if_zero_else_one
merging master in integre