Remove ExternalBuilds, copy and installation using macro.

The different macros were not documented.

Note: We need to implement a copy of the files needed in the CMakeFiles.txt of each project.
Remove SuperBuild from the compilation system.

- Remove the configuration file use by the SuperBuild.
- Use new function from CMake for Qt4 (mafMacroSetupQt.cmake).
- Implement a configuration inside each cmake so compilation can be done independently.

Problemes:

- the system wrapping is completely broken. Since it never worked and was not documented at all
  redoing it from scracth is probably better.
- all the library and files are inside their sub-directory.
  A proper installation system should be implemented.

TODO:

- implement the installation.
- Solve link problem for the examples
- Solve the unit test compilation and implement the system using ctest.
- rewrite the python wrapping.