What you are looking for is the flat db cms portal rom WebAPP at: WebAPP CMS Portal
It has all the requirements requested by you. In addition, despite the fact that it uses fat files, it is much faster then any CMS out there, this is because starting from version 1.0 SE it has a cache and restore system.
It is very easy to install, it would actually el extract itself and guide you with information all the way!
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