Function compacts::bits::and_not

Important traits for AndNot<'a, L, R>

impl<'a, L, R> Iterator for AndNot<'a, L, R> where
    L: Iterator<Item = Cow<'a, Entry>>,
    R: Iterator<Item = Cow<'a, Entry>>,  type Item = Cow<'a, Entry>;

pub fn and_not<'a, L, R>(lhs: L, rhs: R) -> AndNot<'a, L::IntoIter, R::IntoIter> where
    L: IntoIterator<Item = Cow<'a, Entry>>,
    R: IntoIterator<Item = Cow<'a, Entry>>,