fixed problematic getClass.equals - you can't derive from transportclasses to change some specific transport features if you only allow same transport classes made item public to use it in derived classes

derivedtransport.patch

diff --git a/buildcraft/common/net/minecraft/src/buildcraft/transport/BlockGenericPipe.java b/buildcraft/common/net/minecraft/src/buildcraft/transport/BlockGenericPipe.java
index 949426e..cd05778 100755
--- a/buildcraft/common/net/minecraft/src/buildcraft/transport/BlockGenericPipe.java
+++ b/buildcraft/common/net/minecraft/src/buildcraft/transport/BlockGenericPipe.java
@@ -241,8 +246,8 @@ public class BlockGenericPipe extends BlockContainer implements
 		Pipe pipe2 = getPipe(blockAccess, x2, y2, z2);
 		
 		if (pipe2 != null
-				&& !pipe1.transport.getClass().equals(
-						pipe2.transport.getClass())) {
+				&& (!pipe1.transport.getClass().isAssignableFrom(pipe2.transport.getClass()) && 
+					!pipe2.transport.getClass().isAssignableFrom(pipe1.transport.getClass())) ) {
 			return false;
 		}
 				
diff --git a/buildcraft/common/net/minecraft/src/buildcraft/transport/PipeTransportItems.java b/buildcraft/common/net/minecraft/src/buildcraft/transport/PipeTransportItems.java
index 13c966b..bb398ec 100755
--- a/buildcraft/common/net/minecraft/src/buildcraft/transport/PipeTransportItems.java
+++ b/buildcraft/common/net/minecraft/src/buildcraft/transport/PipeTransportItems.java
@@ -38,7 +38,7 @@ public class PipeTransportItems extends PipeTransport {
 	public class EntityData {	
 		// TODO: Move passive data here too, like position, speed and all?
 		boolean toCenter = true;
-		EntityPassiveItem item;
+		public EntityPassiveItem item;
 		
 		public Orientations orientation;