now mapped to more than one PC if required. The simnode_capacity
column in the node_types table determines how many sim nodes can
be packed on one PC. The packing factor can also be controlled via
tb-set-colocate-factor to be smaller than simnode_capacity.

- No frontend code changes. To summarize:
  $ns make-simulated {
    ...
  }
  is still the easy way to put a whole bunch of Tcl code to be
  in simulation.
  One unrelated fix in the frontend code is to fix the
  xmlencode() function which prior to this would knock off
  newlines from columns in the XML output. This affected
  nseconfigs since it is one of the few columns with embedded
  newlines. Also changed the event type and event object type
  in traffic.tcl from TRAFGEN/MODIFY to NSE/NSEEVENT.

- More Tcl code in a new directory tbsetup/nseparse
  -> Runs on ops similar to the main parser. This is invoked
     from assign_wrapper in the end if there are simnodes
  -> Partitions the...