[mod] minor fixes (duckduck_definitions : if a ddg bang is in the query, avoid a useless redirect)
[fix] dailymotion engine : no more html tag in the description
[mod] bing and duckduckgo engines : add / rename locale parameter
[fix] startpage engine : characters with diacritic were preceded by whitespace, and cleaner way to parse the result.
[mod][fix] xpath engine simplified, yahoo engine never returns truncated urls