Ftw-publisher-receiver

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- Only reindex the "modified" index after setting a new modification date.
[mathias.leimgruber]

- Do not reorder if the position of the obj did not change.
[mathias.leimgruber]

- No longer reindex getObjPositionInParent index after reordering.
The position implementation has changes.
[mathias.leimgruber]

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- Cleanup package and extend tests.
[jone]

- Drop Plone 4.2 support.
[jone]

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- Sort data collectors so that we have an expected order.
This allows to affect the order with data collector names.
[jone]

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- Diazo should never touch a response created by the receiver.
[mathias.leimgruber]

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- Fix getObjectbyUid for nonreferenceable objects. Drops Plone 4.0 support.
[tschanzt]

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- Fix updateObjectPosition method. "_objects" does no longer exists.
[mathias.leimgruber]