Add method to bundle for reporting presence of overlays #287
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This PR extends the Bundle interface with a new method
ContainsOverlays
that users of the charm package can use to check whether the bundle they just obtained using one of the Read helpers did in fact contain one or more overlay blocks that were not actually parsed as the Read helpers do not work with multi-document bundles.This new functionality will be leveraged by the charmstore code to reject uploads for multi-doc bundles.