Plone.app.folder

----------------

- Moved migration logic into the BTreeMigrationView to allow subclasses to
override part of the logic.
[hannosch]

- Remove the overly noisy migration report per folder.
[hannosch]

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- Updated tests to not rely on the existence of the Large Plone Folder type,
which was removed for Plone 4.
[davisagli]

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- Nogopip vs. Acquisition take two - not all folders have a getOrdering
method, so we need to avoid acquiring it.
[hannosch]

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- Match ``getObjectPositionInParent`` behavior and handle unordered folders
inside ordered folders shown in the navigation tree at the same time.
[hannosch]

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- Don't try to store an acquisition-wrapped catalog on the positional index.
[hannosch]

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- Only apply monkey patch for `reindexOnReorder` on Plone 3.x & shortcut
indexing completely if the fake index has been installed.
[witsch]

- Replace monkey patch for `Catalog._getSortIndex` with a fake index that
can sort search results according to their position in the container.
[witsch]

- Add optimization for sorting results by folder position for the usual
"all results in one folder" case.
[witsch]

- Add adapter for previous/next support that doesn't need the catalog.
[witsch]

- Remove `getObjPositionInParent` catalog index and use a sort index based
on the folder's order information instead.
[witsch]