Add missing header (std::tolower is defined in <cctype>)
Add missing header (std::tolower is defined in <cctype>)

olifre/root,karies/root,karies/root,root-mirror/root,olifre/root,karies/root,root-mirror/root,olifre/root,root-mirror/root,olifre/root,root-mirror/root,root-mirror/root,olifre/root,karies/root,karies/root,root-mirror/root,olifre/root,karies/root,root-mirror/root,karies/root,olifre/root,olifre/root,root-mirror/root,karies/root,root-mirror/root,olifre/root,karies/root,karies/root,root-mirror/root,olifre/root,olifre/root,root-mirror/root,karies/root