Turn topology.topology and topology.layer into views
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It would be helpful to move the data of topology.topology and topology.layer into views, for easy of portability, and to safely respect view permissions on existance of tables (See #4575).
At the moment the TopoGeometry values do contain references to topology identifier and layer identifier, both of which are numeric and require some centralized support for assignment. It has to be defined how these identifiers should be dealth with, in terms of validity across databases.