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DataNucleus support for persistence to Excel datastores
Refer to datanucleus/datanucleus-core#134
Refer to core issue 128 for database creation/deletion
Refer to core issue 19
Just like with MaxPoidGenerator for RDBMS. We could refer to this generator as strategy = "max", or "increment".
When we make use of a persistable class in the Excel plugin we currently go direct to "manageClasses", whereas we should simply check for StoreData, and only then go to the Excel "Workbook" object to check it.
ODF plugin allows the user to add a column headers row
When we retrieve a List from Excel we retrieve it in the exact same order as persisted. That is, it is stored as a Collection in the owner object. If a user puts some @orderby annotation they may want the list reordering.
This applies to ALL non-RDBMS datastores, so creating some generic code would make sense and reorder them in-memory, maybe using a Comparator.
There is a restriction in POI that you need to add cells for the PK fields before checking if a row is active. To complete this there is a TODO in StoreFieldManager constructor
The API doesn't seem to have changed much
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