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* Made the documentation directory structure a bit more logical by moving 'docs/en/root.txt' to 'docs/en.txt'.
* Found two more sections from the old documentation that are not yet converted to the new format.

Ticket: 383

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Improvements and enhancements to the NestedSet (not BC! please have a look at draft/nestedset_changes.tree).
Added a model that was missing in the repos (model/BlogTag).
Updated a testcase.

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renamed Doctrine_Record::obtainIdentifier() to Doctrine_Record::identifier(), fixed identityMap implementation

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