Improvements to the queuing process when running a query

Currently, the status of i2b2 queries and which queue it is running in can be misleading. Therefore, the queuing process is getting a little facelift.

1. In the QT_QUERY_INSTANCE table the BATCH_MODE column will contain one of the following statuses:

     - QUEUED
     - PROCESSING
     - RUNNING
     - MEDIUM_QUEUED
     - MEDIUM_QUEUE_RUNNING
     - LARGE_QUEUED
     - LARGE_QUEUE_RUNNING
     - FINISHED
     - COMPLETED
     - ERROR
     - CANCELLED
     - NEVER_FINISHED
 
2. The CRC will now return the value in the BATCH_MODE column.

3. The i2b2 Web Client will be updated to look at the BATCH_MODE column to determine the appropriate status to display in Previous Queries.