enable RecordStores to store deletions
handle deleted Records when searching
handle deleted Records in OAI-PMH
handle deleted Records when displaying

Deleted Records handled in brief and detailed display.
add script to unload records for contributor
admin: gitignore PyCharm artefacts
preserve XML declaration (w/ encoding) at ingest

Do not strip out the XML declaration during the ingest pipeline,
as this prevents the XML parser from correctly detecting the
character encoding used.
improve line spacing in text version
gitignore database, load and index logs