Fixes previously failing unit test (class cast exception in creating workbook...tried to cast
to ExternSheet when it was an UnknownRecord due to omission from RecordFactory.
Points out an annoying feature of HSSF architecture.. SID is used for identification instead
of instanceof for the purpose of efficiency and...cleanliness but in the event of unknown
record you can have an unfortunate mismatch. Not sure what an acceptable solution is.
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