export project_dir too
rework run_tracker.sh so the reported IP for the clients can be
overriden and the script is able to find dispersy both in dispersy and
tribler repos.
Work around the fact that we can't tell dispersy where to look for the
bootstraptribler.txt file.
Create the graphs in parallel but still show the exit code of every R script.
Improve the config file, run in optimized mode, use a local tracker.