Now generates a transfer metadata set.

refs #5356

Added logic so the first transfer component added creates a
row in a DB table that can server as a parent record for any
transfer-component-specific metadata added in the future.
Added transfer metadata set UUID reset.

refs #5356

Added resetting of the JavaScript global variable, after the successful
start of transfer, that keeps track of the current transfer metadata
set UUID.
Added UI placeholder for metadata edit.

refs #535
Roughed in UI path to component metadata editing page.
Added storage of transfer type in metadata set table.