merged concurrent to main library

removed PIConditionLock, use PIMutex instead

lib/main/core/piincludes.h

@@ -27,10 +27,9 @@
 #  include <iostream>
 #endif
 #include <atomic>
-#include <mutex>
 
-typedef std::mutex PIMutex;
-//typedef std::lock_guard<std::mutex> PIMutexLocker;
+class PIMutex;
+class PIMutexLocker;
 class PIObject;
 class PIString;
 class PIByteArray;