Removed code that is no longer used and has been commented out

for the last two releases.

 Modified Files:
 	jdbc/org/postgresql/Driver.java.in
 	jdbc/org/postgresql/PG_Stream.java
 Removed Files:
 	jdbc/org/postgresql/core/BytePoolDim1.java
 	jdbc/org/postgresql/core/BytePoolDim2.java
 	jdbc/org/postgresql/core/MemoryPool.java
 	jdbc/org/postgresql/core/ObjectPool.java
 	jdbc/org/postgresql/core/SimpleObjectPool.java