Make test empty
Change jquery
Only parse JSON if it is a string
Remove a logging statement
Detect shift click in heatmap

On shift click we add the currently selected pairs, instead of of overwriting
the current selection.
Toggle heat map mark on table click

The heat map marks can now be toggled by clicking on the table. In addition,
shift clicking adds to the selection instead of overwriting it.
Fix spelling mistake
Add sequence data attribute