Collective.classification.folder

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- Nothing changed yet.

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- Updated following collective.eeafaceted.z3ctable modifications.
[sgeulette]
- Don't create wheel.
[sgeulette]

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- Added treating_groups title in folders vocabulary.
[sgeulette]
- Stored EMPTY_STRING in classification_categories and classification_folders index values when no value.
So it is possible to search on.
[sgeulette]

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- Set maxRssults to 50 to enlarge folders selection behavior search results.
[sgeulette]

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- Do not update folder children when modify event is ContainerModifiedEvent.
[sgeulette]

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- Corrected `on_will_move` to avoid error on delete.
[sgeulette]
- Removed `collective.z3cform.chosen` dependency.
[sgeulette]
- Removed folder rename restriction (now well handled in iconifiedcategory).
[sgeulette]
- Added INextPrevNotNavigable on folder classes (in zcml).
[sgeulette]