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* minor cleanup to prevent the assign identifier quartz job from throwing hundreds of "Duplicate key" errors if the pool of identifiers is small enough to cause lots of collisions

* removed unnecessarily verbose logging from inventory service

* Purchase Order UI changes to make it more consistent with other pages

* fixed #133: added ability to import order line items into an existing order; also added rollback feature

* fixed #50: Illegal attempt to associate a collection with two open sessions when receiving against purchase order

* Minor enhancements to make UI a little more consistent across entire app

* bumped app version to 0.7.8

* removed annoying inventory sampling report constraint

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* added missing primary keys and foreign key constraints to several tables (fixed #62, #108)
* bumped app version to 0.7.9

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