cms - no database required

Im looking for a CMS system - not too comprehensive, but professional in terms of stability and must have the following features. . no database (flat file or bespoke text database is ok) . html output only for files . friendly urls - no [login to view URL] etc ( /colors/[login to view URL] is what i need) . individual head tag per page (editable easily thru individual text boxes on a form) . wysiwyg editor (htmlarea is fine) and code view also so experienced ppl can edit that way . easily allow to create folders for better structure - so could save a file as /folder/[login to view URL] . possibly allow templates to be created and edited so they can then be saved as other files - e.g. open template file, change text etc and then save as another filename. in essence, i want a simple, but effective cms, but with some extra benefits.