Disable auto-refresh on multi-reservation warning

Disables auto-refresh on warning user receives when they
attempt to reserve more than one request and
$allowDoubleReserving is set to "inform".  Replaces with a static
"acknowledge" link.  Resolves issue #3.

Also changes the different messages for $allowDoubleReserving to
better indicate to the user whether their request to reserve an
additional request has actually gone through or not.