* Fix typos in help / usage
* Unified help for socket option and traffic generation
* Respect 80 column rule
* Fix a bug that a warning is given (argument needed) when flowgrind -h is called
* Print help only if user requested it. Otherwise (in case of a cmd
  parsing error) give a hint (like ls, sed, ... does)
Add /doc (doxygen output) to .gitignore
Update TODO
Fix several warnings which appears if build flowgrind with clang
Merge remote-tracking branch 'origin/master' into unified-help
Little EBNF fix in help
Add a FIXME