[Bugs] #1207 UNSP: use layoutmanager as much as possible

[SugarLabs Bugs]

#1207: use layoutmanager as much as possible
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    Reporter:  sascha_silbe               |          Owner:  tomeu            
        Type:  defect                     |         Status:  new              
    Priority:  Unspecified by Maintainer  |      Milestone:  0.86             
   Component:  sugar-datastore            |        Version:  Git as of bugdate
    Severity:  Unspecified                |       Keywords:  r?               
Distribution:  Unspecified                |   Status_field:  New              
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 layoutmanager is supposed to assign a place for every part (index, entry
 metadata, ...) stored inside the (physical) data store, but currently gets
 sidestepped quite a lot. This patch fixes that (except for checksums).

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Ticket URL: <http://dev.sugarlabs.org/ticket/1207>
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