Looks like factory_shipped_username was never really honoured here.
Clean this up while bringing general sanity to the file.

see previous

no real changes, just overall sanity

*runs for cover in fear of Ad's uncommited changes*

(a.k.a. migrated to ports tree)

Discussed with: Jos

Huge commit, but the previous commits have proven to be
harmless, so let's do it!

... and add a make target to execute it properly

fix captive portal prune sessions, radius still needs work, old code copied back but not sure if this works