* ticket/cs278/9520:
[ticket/9520] Additionally filter requests for {common,config}.php
[ticket/9520] New web.config file as suggested by Microsoft using request filter
[ticket/9520] Removed per directory web.config files.
[ticket/9520] Add suggested web.config for root files as suggested by Microsoft.
[ticket/9520] Add some default web.config files for IIS.