"Queue Compression" -- let one do the work for all identical, concurrent searches

Signed-off-by: Mike Rylander <mrylander@gmail.com>
Signed-off-by: Jason Etheridge <jason@esilibrary.com>
Add a $cache_timeout-based backstop for infinite loops

Signed-off-by: Mike Rylander <mrylander@gmail.com>
Signed-off-by: Jason Etheridge <jason@esilibrary.com>
Make sure the "running" indicator goes away

Signed-off-by: Mike Rylander <mrylander@gmail.com>
Signed-off-by: Jason Etheridge <jason@esilibrary.com>