respect coding style

showing the file extensions more visible by default. I still think it's shitty design, but I get worse nightmares over thinking that showing file extensions would become a configuration option.

opera lacks the onunload to make it work

file settings: let people set no more than upper boundary for file uploads, but they should can really go up to the limit

make upload size settings work probably. do not replace whole .htaccess, only replace what is needed. Consistent, human readable input on admin settings page.