Add real support for selecting the interfaces

- Also add some prints to know the interfaces that is being used.
Bigger particles and spped pcap

- Particles are bigger. So they are easier to see.
- Blue particles were changed to white, so they are easier to see.
- The oipgui has a new option -s for the setting the speed of the pcap
  file.
- An -s value of 1000 is normal, 100 is 10x and 10 is 100x