[core] implemented thread-safe(r) FES ordering
[eefscheduler] added changes from codereview (minor stuff) and moved scheduler call again from cSimulation to Tkenv and Cmdenv respectively
[eefscheduler] encapsulated getProcessingDelay-call in the getEventDuration() of cMessageThe duration of a message is invalidated in scheduleAt and sendDirect/Delayed
[eefscheduler] solved initialization bug of t_start- now using delivd instead of t_start (t_start was redundant to delivd)- removed t_start from code- some code cleanup (some debug output removed..)
Initial import of Horizon 4 release.