Added a bunch of madgraph related things, inluding:

HepMC - latest version (also compiled)
HepMC - Old 2007 version
convertStdHep - Converts STDHEP files to HepMC files, uses old HepMC
A lot of madgraph tests
Merge branch 'master' of github.com:cesarotti/Dark-Photons

Conflicts:
	madgraph/threegamma/bin/internal/__init__.pyo
	madgraph/threegamma/bin/internal/banner.pyo
	madgraph/threegamma/bin/internal/check_param_card.pyo
	madgraph/threegamma/bin/internal/cluster.pyo
	madgraph/threegamma/bin/internal/coloring_logging.pyo
	madgraph/threegamma/bin/internal/combine_runs.pyo
	madgraph/threegamma/bin/internal/common_run_interface.pyo
	madgraph/threegamma/bin/internal/extended_cmd.pyo
	madgraph/threegamma/bin/internal/file_writers.pyo
	madgraph/threegamma/bin/internal/files.pyo
	madgraph/threegamma/bin/internal/gen_crossxhtml.pyo
	madgraph/threegamma/bin/internal/madevent_interface.pyo
	madgraph/threegamma/bin/internal/misc.pyo
	madgraph/threegamma/bin/internal/save_load_object.pyo
	madgraph/threegamma/bin/internal/sum_html.pyo
	madgraph/threegamma/index.html