[C++][CMake] Merged fake-fcl with fcl.hpp (splitted in .hpp and .hxx file). Propagated flag -DWITH_HPP_FCL to all binaries

Nicolas Mansard authored 8 years ago and Nicolas Mansard committed 8 years ago

[CMake] Solved bug #236. Marginally changed the source/header listing policy to avoid similar bugs in the future.

Conflicts:

	CMakeLists.txt

As it is done in src/multibody/parser/python.cpp, one can create a shared_ptr to a new Model in c++,
send this into a python namespace, update it in python, and continue to work on the Model in c++.

An example to use this as a simple parser is given in unittest/python.cpp and models/simple_model.py

(squashed version)

  * One Definition Rule was still not enforced.
  * Declare function in header sample-model.hpp, implement them in
    sample-models.cpp
  * Add sample-models symbols to libpinocchio.

[cmake][C++][bug fix] Moved initialization of static const variable gravity 981 from model.hpp to model.cpp. libpinocchio.so is no more empty. Caution : Pinocchio is more a header-only library. One should alwais link against shared library