Pyscanmaster

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* Raise explicit error when Tlog "record code not found".

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* Add a sort of hack, in the event that multiple SaleTotal records are found in Tlog.

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* Add initial stab at generic ASCII data parsing, for employee file.

* Add ``AdjectivePrice`` model, ``Item.adjective_price`` relationship.

* Add some convenience properties to ``ElectronicCoupon`` model.

* Add ``ITEM_TYPE`` enumeration, and ``Item.item_type`` convenience property.

* Add "failsafe" for model integer properties, with logged warning.

* Refactor ``db`` sub-package a bit.

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* Add ``Department`` and ``ElectronicCoupon`` models.

* Add ``EJ_TRANSACTION_TYPES`` enum values.

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* Several changes; see revision log. This version is more of a production save
point than anything else.

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* Added checking account number to ``parse_ssxcusp_record()``.