Refresh button disabled

[zebu1er]

The refresh button is only enabled when the CanModify condition is met. But refreshing can be done at no risk even if datas are readonly.
I suggest this patch (line 200) to correct that meaningless limitation :

• Buttons[nbRefresh].Enabled:=CanModify;

• Buttons[nbRefresh].Enabled:=Enabled and FDataLink.Active and not FDataLink.Editing;