[FIX] account: Bank statement reconciliation
[FIX] account: Bank statement reconciliation

It was impossible to make a partial reconciliation with several lines.
Each time a new line is proposed for the reconciliation, the previous
partial reconcialtion is canceled. The partial reconciliation can just
be proposed on the last selected line when:
self.get("balance") * (last_line.debit - last_line.credit)<0

opw:656501

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