Plone.app.viewletmanager

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- Implement IViewView so viewlets registered to this interface can be managed.
[elro]

- Use Unicode up/down arrows in manage-viewlets.
[esteele]

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- Provide some basic styling for manage-viewlets. Remove the use of
.portletHeader and .portletItem styles and define everything inline.
Closes http://dev.plone.org/plone/ticket/10006
Closes http://dev.plone.org/plone/ticket/10178
[esteele]

- Push manage-viewlets css into style_slot instead of css_slot.
[esteele]

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- Updated manage-viewlets.pt to the recent markup conventions.
References http://dev.plone.org/plone/ticket/9981
[spliter]

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- Use the new zope.site package.
[hannosch]

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- Protect forced Acquisition wrapping by an interface check on IAcquirer. This
closes http://dev.plone.org/plone/ticket/9862.
[hannosch]

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- Added translations for Show/Hide labels in manage-portlets view:
label_show_item and label_hide_item. These msgids are shared with
manage-viewlets view to show/hide viewlets. This closes
http://dev.plone.org/plone/ticket/9733
[naro]

- Use JS calls to handle show/hide/move actions instead of forcing a page
reload. Will fall back to old method if JavaScript is not available.
[esteele]