CVS Check-in: Extra pooling for Loader

Loader used to create new connection for each backend COPY statement
Added connection pool for Loader, used when running COPY and sending intermediate results

Files:

RCS file: /cvsroot/gridsql/apps/gridsql/src/com/edb/gridsql/engine/loader/LoaderConnectionPool.java,v
done
Checking in src/com/edb/gridsql/engine/loader/LoaderConnectionPool.java;
/cvsroot/gridsql/apps/gridsql/src/com/edb/gridsql/engine/loader/LoaderConnectionPool.java,v <-- LoaderConnectionPool.java
initial revision: 1.1
done
Checking in src/com/edb/gridsql/engine/loader/PostgresWriter.java;
/cvsroot/gridsql/apps/gridsql/src/com/edb/gridsql/engine/loader/PostgresWriter.java,v <-- PostgresWriter.java
new revision: 1.3; previous revision: 1.2
done
Checking in src/com/edb/gridsql/engine/loader/Loader.java;
/cvsroot/gridsql/apps/gridsql/src/com/edb/gridsql/engine/loader/Loader.java,v <-- Loader.java
new revision: 1.13; previous revision: 1.12
done
Checking in src/com/edb/gridsql/communication/NodeAgent.java;
/cvsroot/gridsql/apps/gridsql/src/com/edb/gridsql/communication/NodeAgent.java,v <-- NodeAgent.java
new revision: 1.3; previous revision: 1.2
done
Checking in src/com/edb/gridsql/queryproc/QueryProcessor.java;
/cvsroot/gridsql/apps/gridsql/src/com/edb/gridsql/queryproc/QueryProcessor.java,v <-- QueryProcessor.java
new revision: 1.19; previous revision: 1.18
done
Checking in src/com/edb/gridsql/engine/XDBSessionContext.java;
/cvsroot/gridsql/apps/gridsql/src/com/edb/gridsql/engine/XDBSessionContext.java,v <-- XDBSessionContext.java
new revision: 1.7; previous revision: 1.6
done
Checking in src/com/edb/gridsql/engine/ProducerSender.java;
/cvsroot/gridsql/apps/gridsql/src/com/edb/gridsql/engine/ProducerSender.java,v <-- ProducerSender.java
new revision: 1.10; previous revision: 1.9
done
Checking in src/com/edb/gridsql/metadata/SyncCreateIndex.java;
/cvsroot/gridsql/apps/gridsql/src/com/edb/gridsql/metadata/SyncCreateIndex.java,v <-- SyncCreateIndex.java
new revision: 1.3; previous revision: 1.2
done
Checking in src/com/edb/gridsql/parser/SqlCopyData.java;
/cvsroot/gridsql/apps/gridsql/src/com/edb/gridsql/parser/SqlCopyData.java,v <-- SqlCopyData.java
new revision: 1.7; previous revision: 1.6
done
Checking in src/com/edb/gridsql/parser/SqlInsertTable.java;
/cvsroot/gridsql/apps/gridsql/src/com/edb/gridsql/parser/SqlInsertTable.java,v <-- SqlInsertTable.java
new revision: 1.14; previous revision: 1.13
done