SwapHash used to be a key in the sweeps table. Now the key is outpoint which
replaces columns outpoint_txid and outpoint_index. In-memory structures and unit
tests were also updated to use outpoint as key. Outpoint is truly unique.
Mixed batches approach covers the case where all the inputs are cooperative
(function publishBatchCoop) and it is better than fully non-cooperative case
(function publishBatch), but it can also create such transaction if needed, i.e.
if all the sweeps are non-cooperative. So we can remove functions publishBatch,
publishBatchCoop, option WithMixedBatch and associated code in greedy batch
selection algorithm.
This is needed to avoid non-standard batch transactions (larger than 400k wu).
A non-cooperative input is 393 wu, so 1000 inputs are still under 400k wu.
Use SigHashDefault instead of SigHashAll in weight estimations.
Actual code uses SigHashDefault, not SigHashAll. SigHashAll is 1wu larger.
Use the actual destination address in weight estimator, not taproot always.
In the test the type of address is P2WPKH, not taproot.
Updated testSweepFetcher to calculate fee, fee rate and weight accurately and
to compare the data observed in the published transaction with the estimates.
If custom fee rates are used, the algorithm is tried. It selects a batch for the
sweep using the greedy algorithm, which minimizes costs, and adds the sweep to
the batch. If it fails, old algorithm is used, trying to add to any batch, or
starting a new batch.
