netstream.c: Added nets_sync() functionality
netstream.c: Added nets_read_cancel() + a few bugfixes
hub/connection: Add graceful disconnect + ASCII state diagram to docs

I somehow managed to add functionality to hub/connection.c and simplify
the code a bit at the same time. Sweet.
hub/connection: Allow Connect() in the TIMER state

(plus two insignificant fixes)
Minor globsterctl doc + globster-launch comment fixes