'npm audit fix' and 'npm audit' preparing for building.

Such as missing closing parenthases, forgotten commas, wrong
assignments, etc.

This method is similar to a recursive 'toString'. It has
three modes of operation. Mode 2 is most similar to 'toString'
and returns an array of 'id's with interspersed arrays of 'id's
for the sublists. The default, mode 0, returns an array of
object with 'id' and 'children' properties. Mode 1 is similar
to mode 0 except omits the 'children' property if there are
no children.

These tests piggy-back on the already existing 'nested'
tests by assessing the output of 'toHierarchy()' after
the row-dragging. This is done by adding an 'onEnd' event
handler to update the DOM based on current row structure
and then compare that text to the expected text.