RecDef.Elem now has xstream-omitted elemList, filled during resolution.  Now the deepCopy works properly.
Cloning of attr and attr-group as well, so that docs (and other things) are now properly attached.
Fixes #381:  DataSet entries in the list can now contain <schemaVersions>.
DataSet entries now also show DataSet name, and local recordCount visible.
Merge pull request #384 from delving/issue381

Adds schemaVersions attribute to the dataset entries retrieved from the hub