Previous to this fix, calling fixedPanel without an
explicit cursor argument would cause an error due to
the vector of possible values being passed as the
actual cursor argument to absolutePanel.
These functions were temporarily ripped out of Shiny and moved
to the htmltools package. We've discovered that it's safe to
keep including them in shiny; as long as the functions in shiny
and the functions in htmltools are identical, the user won't
receive a conflict warning.
