Internalise accumulator IDs

[miratepuffin]

When creating an accumulator I need to specify a unique ID for it i.e.:

    let hub_score = val::<f32>(0).init::<InitOneF32>();
    //Taken from the hubs and auth algorithm

This could be quite confusing for new users and lead to silly mistakes with very odd outputs if two algorithms using the same state IDs were to be chained.