Products.cmfplacefulworkflow

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- Removed createSnapshot() call from exportimport.txt test. It wasn't doing
anything useful, and caused a distracting test failure not related to
CMFPlacefulWorkflow.

- Fix 9359: CMFPlacefulWorkflow defines __implements__ with zope3 interface.
[encolpe]

- Remove use of the deprecated document_byline macro in the placeful
workflow configuration template.
[davisagli]

- Register configlet icon using icon_expr for forwards-compatibility
with Plone 4.
[davisagli]

- Copied safeEditProperty function from CMFPlone's migrations package,
as that is being removed.
[davisagli]

- Change imports from Globals to use canonical locations, for compatibility
with Zope 2.12.
[davisagli]

- Define wtool inside the prefs_workflow_policy_mapping template.
[hannosch]

- Removed settings of the portal_skins tool itself from skins.xml.
Specifically, allow_any was set to False, which bit me.
[maurits]

- Made workflow policies translatable in prefs_workflow_localpolicies_form.
[vincentfretin]

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- The `Cancel` button on the local workflow configuration screen was saving
data as much as the `Save` button. Now it actually cancels the operation.
[hannosch]

- Made sure you cannot set a workflow configuration on a non-folderish item
in the site root. The actual configuration would end up on the site root.
[hannosch]

- Change the local workflow configuration screen to not be shown for the
site root, even if you accidentally type in the wrong URL.
[hannosch]

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- Declare package dependencies and fixed deprecation warnings for use
of Globals.
[hannosch]

- Copied safeEditProperty from CMFPlone.migration_util to avoid a dependency.
[hannosch]

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- Port evolutions from the 1.3 maintenance branch (old style product).
[encolpe]

- Fixed bad version in metadata.xml (again)
[encolpe]

- Removed Favorite content type.
[hannosch]

- Fixed "ValueError: 'acquisition' is not a workflow ID" in
prefs_workflow_policy_mapping. Fix prepared by jhackel. Fixes
http://dev.plone.org/plone/ticket/8101
[maurits]

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- Fixed bad metadata.xml.
[encolpe]

- Fixed incorrect variable name in exception message.
[davisagli]