HM: Set path and metadataPrefix of oaiDownloadProcessor
HM: BuildRequest accept additionalHeaders (e.g. Host header from periodicDownload)
HM: Components 4.10 with additionalHeaders in buildRequest
TS/JPM: Work in progress: making Meresco-Oai work (only) with new new MultipleSequentialStorage
TS/JPM: fixed most Meresco-Oai tests to work with new MultiSequentialStorage interface (/protocol)