Wilders Smoothing

``` use tacommon::traits::Indicator; use wildersrs::Wilders;

let mut wilders = Wilders::new(5); asserteq!(wilders.next(81.59), None); asserteq!(wilders.next(81.06), None); asserteq!(wilders.next(82.87), None); asserteq!(wilders.next(83.00), None); asserteq!(wilders.next(83.61), Some(82.426)); asserteq!(wilders.next(83.15), Some(82.5708)); asserteq!(wilders.next(82.84), Some(82.62464)); asserteq!(wilders.next(83.99), Some(82.897712)); asserteq!(wilders.next(84.55), Some(83.2281696)); asserteq!(wilders.next(84.36), Some(83.45453568)); asserteq!(wilders.next(85.53), Some(83.86962854400001)); asserteq!(wilders.next(86.54), Some(84.40370283520001)); asserteq!(wilders.next(86.89), Some(84.90096226816)); asserteq!(wilders.next(87.77), Some(85.474769814528)); assert_eq!(wilders.next(87.29), Some(85.83781585162241)); ```