App.store.WES: check if model has changes; stub for model's "datachanged" event
App.store.WES: check if model has changes; stub for model's "datachanged" event

Signed-off-by: Oleg Verych <a5ce24b76737c0ca6b8faa55c4f938064a1695cf@gmail.com>

olecom/supro,suprojs/supro,olecom/supro,suprojs/supro,suprojs/supro,olecom/supro