rustsat-v0.5.1

Features

• Incremental precision in DPW
• Format vars and lits nicely with debug

Bug Fixes

• Make Node type (of dbtotalizer) opaque. This is technically a breaking
  change, but since the Node type was never intended to be transparent, we are
  not treating it as one. If you are relying on having access to the Node
  type, use the feature internal instead, but note that the internal API is
  unstable.

Testing

• Fix warnings