Implement config file BSS address setting
Add BSS addresses to config files
Merge BSS address config file setting
Fix -W, in particular pattern exhaustiveness
Add missing \n (to display+flush nicely)
Use multiple random bootstrap servers

- restartEvery is now per bootstrap signal, not per bootstrapped client
  anymore. One new client sends out maxNeighbours bootstrap requests.
- The beginning of the bootstrapping server looks a bit dead, but this
  quickly goes away (few seconds).
Fix multi client using drawing config file
Config file: change default drawing bootstrap addresses
Update readme with 3-cluster picture
Merge multi-bootstrap behaviour (Issue #39)