[Bugs] #1813 UNSP: Do not remove internal metadata fields while rewriting object

[Sugar Labs Bugs]

#1813: Do not remove internal metadata fields while rewriting object
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    Reporter:  alsroot                    |          Owner:  tomeu      
        Type:  defect                     |         Status:  new        
    Priority:  Unspecified by Maintainer  |      Milestone:  0.88       
   Component:  sugar-datastore            |        Version:  Unspecified
    Severity:  Major                      |       Keywords:             
Distribution:  Unspecified                |   Status_field:  Unconfirmed
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Description changed by alsroot:

Old description:

> For now, on every IndexStore.store() call, entirely directory is being
> swept out including internally used fields like checksum.

New description:

 For now, on every IndexStore.store() call, entirely directory is being
 swept out including internally used fields like checksum.

 |TestCase|
 * upload .xoj to journal
 * upload the same .xoj once more
 * only one(first one) valid entry in Journal

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Ticket URL: <https://bugs.sugarlabs.org/ticket/1813#comment:1>
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