ZODB Components: Products import compatibility (MR !1271).
Arnaud Fontaine authored
This implements Products import compatibility based on Component.source_reference
using existing import hooks so that Products.ERP5.Document.Person for example
is importable (actually returning erp5.component.document.Person module).

This only works with non-FS modules (IOW when the ZODB is accessible and
portal.portal_components is available).
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