OAI-PMH improvements

Represent any record that has a datestamp (e.g. was live at some point) that isn't in the 'archive' dataset as deleted.

Item Type: EPM
Version: 1.0.0
SWORD Depositor: Mr John Salter
Depositing User: Mr John Salter
Date Deposited: 17 Jun 2015 10:58
Last Modified: 17 Jun 2015 10:58
URI: http://bazaar.eprints.org/id/eprint/411
File List: cfg.d/zz_oaipmh_patch_core_EPrints_OpenArchives.pl