[FIX] webmail: getting rid of the (most probably) proprietary licensed Windows XP icons (finally) - replacing them with closest matches of the Jini iconset (except help.gif, that one is a copy from the Silk 16x16 icons) which is used in Admin sections (placed the PNGs on white bg box and made it slightly "rounded" for now) - hopefully in some next Tiki major version we can have full iconset themes support...