PIIODevice registration dramatically optimization

libs/main/io_devices/pisharedmemory.h

@@ -31,7 +31,7 @@
 
 class PIP_EXPORT PISharedMemory: public PIIODevice
 {
-	PIIODEVICE(PISharedMemory)
+	PIIODEVICE(PISharedMemory, "shm")
 public:
 	
 	explicit PISharedMemory();
@@ -76,7 +76,6 @@ public:
 protected:
 	bool openDevice();
 	bool closeDevice();
-	PIString fullPathPrefix() const {return PIStringAscii("shm");}
 	PIString constructFullPathDevice() const;
 	void configureFromFullPathDevice(const PIString & full_path);
 	PIPropertyStorage constructVariantDevice() const;