* Use now crosstraffic keyword instead of the terribly missleading
fullduplex keyword. It is activated by default now in the current
default model, use --cfg=network/crosstraffic:0 to turn it off.
+ * Experimental: new configuration option --cfg=surf/nthreads:N to run
+ analytical models in parallel with N threads (default is 1).
* Ongoing refactoring the model parsing to make XML files optional
(more work is needed here to fully achieve this goal)