Make CSS for active listview "rows" more generic

Instead of specifying that only <tr> tags with the "active" class
will be highlighted, the listview CSS should highlight *any* element
inside the listview with a class of "active". This allows for, say,
unordered lists to be used to lay out listviews.
Restore remove button back in projects, texts, Q's

Eventually the button (and the checkboxes that go with it) should be
made visible and available, or hidden and unavailable, depending on
whether the logged-in user has appropriate admin rights. For now,
they will just be visible to all users.