FileXfer now bridges upload and download without routing through Tell luqin/luqout. Muq routes are definitive, and the helper world is being welded into the new skin.
Uses FileXfer worker and retains parent-oriented helper semantics.
Uses FileXfer worker in download mode with the same visual system.
Supplants SendFile for active Muq-facing transfer work.
Still functions when Parental, Parentop, and BasicData collapse to one page.