Removes unused code that passed wrong type to Path:
"Path(inputs[-1])"

This handles the case where the sheet is the empty string,
and a subsheet is specified.

Previously, moveToRow() would return True, and set the cursor
row index to the nonexistent row, with no visible errors.
For slow loading sheets, checkCursor() could then move
the cursor to an earlier row.

Using int indices internally is better than using sheet names,
because sheet names were ambiguous when sheets had the same name,
for example, the name "sample" in:
vd sample.tsv b.tsv sample.json +1:2