Implemented class for synchronising slice viewers.  So far works on cameras.
Implemented class for synchronising slice viewers.  So far works on
cameras.

fvpolpeta/devide,ivoflipse/devide,fvpolpeta/devide,nagyistoce/devide,ivoflipse/devide,chrisidefix/devide,zhangfangyan/devide,chrisidefix/devide,zhangfangyan/devide,nagyistoce/devide