Plone.app.querystring

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- Fix vocabularies sorting
[ebrehault]

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- Fix migration from Plone 4 to Plone 5.
[pbauer]

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- Creator criteria: pur currentUser on top.
[mvanrees]

- Migrate Creator string.is to selection.any.
[mvanrees]

- add user vocabulary to plone.app.querystring.field.Creator.
[vangheem]

- do not need "is" when there is an "any" operator.
[vangheem]

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- Hide upgrade-profiles when creating a new site.
[pbauer]

- Replace selection.is with selection.any for portal_types and review_state
operations, and add selection.any for Creator operation.
[frapell]

- Actually convert the value to a datetime for the DateIndex query modifier.
[frapell]

- Do not fail if the 'Between' operation is called with an empty value, and
instead return a list with 2 empty values.
[frapell]

- Fixed possible problem with ``custom_query`` parameter where
theoretically a second invocation could inadvertently be using the
value from the first invocation.
[maurits]

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- Fix getObjPositionInParent be sortable by default
[datakurre]

- Add operators selection.any and selection.all to Subject.
[MrTango]

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- Implement ``is``, ``lessThan`` and ``largerThan`` operators for integer fields (fixes `32`_).
[rodfersou]