[BISERVER-11217] Update the metadata datasource to store an Instaview datasource type property - Adding flag to instaview generated metadata data sources. Added xmi extension to metadata datasource in export manifest. Also added generic WIZARD_GENERATED_DATASOURCE to avoid having to explicitly omit each generated metadata data source type. Added instaview datasource service and javascript for custom datasource type
Merge pull request #406 from pminutillo/5.1-LEGACY

[BISERVER-11217] Update the metadata datasource to store an Instaview da...