bugfix: fix threading in the UE
Various problems were found with the basic simulator. Variables used by various threads for synchronization need to be initialized properly. That is before the various threads start using them. This goes for: - UE->is_synchronized - UE->proc.instance_cnt_synch - UE->proc.instance_cnt_rxtx The function "UE->rfdevice.trx_start_func" was called in "UE_thread_synch" but should be called in "UE_thread" because "UE_thread" is the one that calls "UE->rfdevice.trx_read_func" and there is no guaranty that the call to "UE->rfdevice.trx_start_func" is done before as it has to (it's in another thread). And finally "pthread_cond_signal(&proc->cond_rxtx)" was called twice, which may not be a problem but was certainly not intended. Plus removing one call simplifies the code by removing some "if" logic, which is a good thing per se. This commit was not tested with a real UE and may thus introduce some issues. Hopefully not!