- #64: the on-chain invalidation now pays the current network fee through a
configurable fee-policy setting (default eta:2); baltx_fees is only the
offline fallback. The change output is dust-guarded: coins are appended until
the change clears the wallet dust threshold.
- #65: a will item whose father is missing/stale is handled defensively in
check_invalidated and discarded by add_willtree instead of raising KeyError.
- #66: children are stored as a list (dict accepted for older data/tests).
- Refresh the translation catalogs and fix stale source line references.
- New tests for the invalidation fee policy, the dust guard and the father
link handling.