Products.resourceregistries

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- Silence the `Nothing to import.` log messages.
[hannosch]

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- Changed the registries moveResourceAfter and moveResourceBefore methods to
gracefully handle missing destination ids. This is useful for GenericSetup
upgrade steps to work even if the resources specified in "insert-after" or
"insert-before" do not exist.
[hannosch]

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- Avoid deprecation warnings under Zope 2.13.
[hannosch]

- Adjusted tests to match new content-type for JavaScript in Zope 2.12.7+.
[hannosch]

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- Add purge support to export/import handlers.
[elro]

- Fix the authenticated checkbox on the kss form.
[elro]

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- Add an option 'applyPrefix' to stylesheets. This can be set in the UI, in
the various constructor methods, or as an attribute in a cssregistry.xml
file. It defaults to false. It has no effect in debug mode. In non-debug-
mode, however, it will parse a stylesheet for 'url()' statements that
contain *relative* paths. These will be prefixed with the Plone site path.
If the stylesheet id contains a path (e.g. '++resource++foo/css/bar.css')
this will be used in the prefix as well. The goal is to make relative paths
internal to a resource directory work, even when resource merging is used.
Previously, it'd break because resource merging changes the URL.
[optilude]

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- Apply a marker interface ICookedFile to the files created on the fly for
cooked/concatenated resources returned by ResourceRegistries. This makes
it easier to detect these for caching purposes and treat them differently
to in-ZODB files, which may also be instances of OFS.Image.File.
[optilude]