* refactored some member names for readability and ccc (code convention conformance)
* took away two refs from Rest.Inventory since
* System.IO is part of System
* System.Xml.Serialization is part of System.Xml
* Migration should be automatic on sqlite and mysql
* Migration is not automatic on mssql, you will need to drop the invType column manually
* Migration should be fine, but as for any db change, I would recommend making sure you have backups before moving past this revision