In the before-P5 days we pointed from the <handShift> element to <hand>s
elements in the <handList>. Now in P5, if we are encoding a manuscript, we
also have the <handDesc> element in the <msDescription>.
Question: is it still useful to list the manuscript hands in the
<handList> if we have a <handNote> element for each hand in the
<handDesc>? Can we just point to the <handNote> rather than to the <hand>?
If we have the <handList> *and* the <handDesc> we'd need, I suppose, to
link the <hand>s and the corresponding <handNote>s (using the corresp
attribute?), as we'd want to be able to connect <handNote> to the places
that refer to the corresponding hands.