** DONE unique posts!!!
Don't overwrite old posts when creating new posts or renaming them
When saving post, check for uniques of 'file' first, if not unique add number
to it, till unique file name is found, then check for uniqueness of slug. If
not unique send back error, and don't save the file!!!
** DONE remove stale html pages in www,
when renaming old slug.html remain
** DONE add new page
Update