Patch provided by Adrian (slightly reworked by Constantin).

Patch provided by Adrian (slightly reworked by Constantin).
Enable the use of fastjet 3 (3.0.5 was tested). Not all features are implemented
in the wrapper. In particular  fj::JetMedianBackgroundEstimator is commented, and
we still use RangeDefinition instead of Selector. Can be changed at a later stage.
Verified that raw spectra are not changing if you have fastjet 2.4.x.
(Also with 3.0.5 raw results were the same for the same settings as with 2.4.x)
More tests are being performed by Adrian.

To install fastjet 3. Follow $ALICE_ROOT/JETAN/README_FASTJET
Configure fastjet with:
--enable-debug --enable-shared --enable-cgal --disable-monolithic --disable-static

Order to load libraries:
  gSystem->Load("libCGAL");
  gSystem->Load("libfastjet");
  gSystem->Load("libsiscone");
  gSystem->Load("libsiscone_spherical");
  gSystem->Load("libSISConePlugin");

  gSystem->Load("libJETAN");
  gSystem->Load("libFASTJETAN");
  gSystem->Load("libPWGJEEMCALJetTasks");