The recent work to make entire rows clickable in the datagrid preventing
browser shortcuts for opening in new tabs/windows from working. This was
because we used an onclick handler, instead of letting the browser do
all the work.

We now wrap each cell in an <a> instead. If the cell already defined a
URL, that takes precedence, but it otherwise defaults to the URL of the
object that row represents.

Tested keyboard shortcuts and right-click menu on the links. Saw it do the

right thing in all cases.