Permalink settings page should offer a filesystem API based way to save .htaccess

[mark-k]

Right now if .htaccess is not writable from PHP, the user is presented with the rules he should manually copy&paste into the file. There is no real reason to sent the user at that point to launch his FTP software to do something that in most cases can be done via the filesystem API. The filesystem API is both faster and most likely less prone to user mistakes.