Metacat

Add a new class variable - isArchived for class IndexEvent.

Update the documentation about those classes.

Add a event and eventlog for the index.

Use the identifier set to get the list of ids in the member node.

The returned ISet should be Identifier.

Add method to get identifier set.

Set up a Timer to run the regenerating solr index task periodically.

Add code to handle delete data package information when delete a pid in the solr index.

Add two static methods to get the SystemMetadata and data object InputStream for the specified id.

Add code to check if the metacat.properties is available.