Check if file exist before using the cat command. Fixes #50.
Use boost::program_options for managing command line options of the executables.
Existing scripts in example/Tutorial3/macro have been updated to use the new format.
Your own executables are not affected, but your scripts which use FairMQ executables have to be updated to the new format.
Use the `--help` option with any FairMQ executable to find out the available options.
state machine update
fix some typo