Changed Controller to Mediator.
Mediator can send global signals to other mediators.
Added global modelStore that can be accesed by Models and Mediators.
Example1 now using mediator and modelstore.
Updated wx_example2 to use Mediator and modelstore.
Started example3 (signal passing between frames)
Example 3 Send signals to multiple gui's.
Update to Page selector and its model
Updated OlvCtrl
Added weakref Model store