fastjet example program to illustrate the use of the fastjet::Filter class

We apply different filter examples to either the hardest jet of the given event, or to the composition of the two hardest jets:

two examples of a filter keeping a fixed number of subjets (as in arXiv:0802.2470)
a "trimmer" i.e. a filter keeping subjets carrying at least a given fraction of the pt of the jet (arXiv:0912.1342).
two examples of filter in combination with background subtraction

run it with : ./11-filter < data/single-event.dat

Source code: 11-filter.cc