PY: keep sums.
PY: resize columns to contents.
PY: show currencies.
PY: support updating Receipts entries.
PY: OperationsManager::UpdateEntry().
PY: editable entries model.
PY: ops tab is more high-priority.
PY: summing fixes.
Merge branch 'master' of github.com:0xd34df00d/leechcraft
PY: fixed default count in the dialog.
PY: return true from setData().
PY: proper edit widget for accounts.
PY: fixed delete query generation.
PY: support deleting receipt entries.
PY: support removing entries in the EntriesModel.
PY: support removing operations in UI.