RD.frommodel: try to find SIP even when not passed in
createSIPfromTransferObjects: move metadata

Currently, only objects/ and metadata/submissionDocumentation are
moved. This moves the entire contents of metadata/ into the new SIP.
This is necessary to persist DC metadata.
dev-helper: understand versioned Debian packages

refs #6523
dev-helper: skip Depends: lines

refs #6523
dev-helper: handle multiline Depends statements

refs #6523
transcoder: Add a few stdout separators