Bug 4177 opaccloud missing from the system preferences interface

Bug 4177 opaccloud missing from the system preferences interface

There is no option to toggle the (existing) syspref OpacCloud. This patch adds one.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Inserted tags manually, enabled system preference, tag subject cloud displays nicely.

Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Liz Rea - Catalyst <liz@catalyst.net.nz>