Semaphore definitions changed (from sem_t* to sem_t)
Ticket #333: Insufficient memory for semaphores
Ticket #304 (repeated receive), nosub stats
Ticket #327 : Send 'Me' in case a matching listener is not found for the received unicast 'Mr' or listener expecting different topocounts
Ticket #334
Ticket #337 (PD request mutex issue)
Ticket #292, #315, #328
Ticket #297, #298, #321
Ticket #338: Fixed issue, where setting the callback attribute of pd-com-parameter or pd-parameter to always instead of on never triggered the callback
#264 added documentation for changes in commit 2170
