#98 Change to 5 byte reference IDs.

[J. Scott Edwards]

Change so that reference IDs are 5 bytes instead of 4. I think that it should auto magically convert old 4 byte ID objects to 5 bytes, so all of the existing objects don't have to be converted.

Use the value 0xFF for the uppermost byte and that will indicate that it is an old object?

Or if the object checksum doesn't match try converting it from an old object?

[J. Scott Edwards]

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Instead of using 0xFF for the 4 byte page, store the 4 byte page in the header so it can be any value.

[J. Scott Edwards]

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This is a duplicate of #1916782. Not closing because this has additional information.