Proxy auth not working

[shengalts]

Trying to download file via proxy: /AUTH "proxyTestUser" "proxyTestPass" /PROXY "http://192.168.1.36:8080" and get "407 Proxy Authentication Required".
In source you use CURLOPT_USERNAME and CURLOPT_PASSWORD for /AUTH variables, but for proxy /AUTH must be CURLOPT_PROXYUSERNAME and CURLOPT_PROXYPASSWORD. May be add new parameter, for example, /PROXYAUTH?

Very good plugin since inetc not always do the deal!