version 2.93 ready to master

remove PIString << operators

libs/main/io_devices/pisharedmemory.cpp

@@ -170,7 +170,7 @@ bool PISharedMemory::closeDevice() {
 
 PIString PISharedMemory::constructFullPathDevice() const {
 	PIString ret;
-	ret << path() << ":" << dsize;
+	ret += path() + ":" + PIString::fromNumber(dsize);
 	return ret;
 }