Change the Replace constructor argument order

[harendra-kumar]

In incremental folds:

data Incr a =
      Insert !a
    | Replace !a !a -- ^ Replace new old

Replace old new may read better as "replace old by new".

[adithyaov]

Both make sense to me depending on the picture of how a window looks in my mind.
Insert new and Evict old vs Replace old by new
Is there a compelling argument for the proposal?

[adithyaov]

Need to also change it in,

• streamly-indicators
• streamly-statistics

[adithyaov]

Check if the intuition is proper. Look at a few combinators and check.