[Support font modification through Appearence object]

http://www.expandframework.com/forum/6-bugs/3781-in-imodelrepositoryitem-not-show-complex-properties-for-example-font/5593.html
[do not run merging algorithms if no merging is used]

http://www.expandframework.com/forum/5-installation-configuration-a-updates/3782-authentication-form-not-displaying.html#5597