If a function is ignored and it has sub-functions, this sub-functions
are cloned into blackbox package and are ignored when the function is
called, perhaps if this sub-function are called from outside, they are
still handled by go2pins.

Need to be handled next :
  - Ask user if he is ok with that
  - Handle recursion for each package(main/ blackbox)

* main.go,
  tools/blackbox : Here.