Removed unused test code.
Test to setup Germplasm and Germplasm list data.
Changed test super class hierarchy so that both service and data managers are available.
Removed validation based on DB identifiers being +ve or -ve.
Removed unused local method and some unused imports.
Hibernate debug settings for development only.
More quick hack solutions to get Middleware to point to and do all querying against a single merged DB.

* Existing methods that resolve to separate central session based on ID signs changed to return the same local session in all variants of DB switching method.
* Removed unused variants of the DB switching methods.

We still have two sessions being created but the central session is now pretty much unused. Local session becomes the new single session against the merged DB for all operations.
Quick Hack: Override workbench's program to local/central DB mapping bean to always return the same (merged) DB per crop.
Added measurement records for the Nursery linked up with Germplasm records. Load the nursery after saving and assert some basics.