feth/peinard — Issue #1: peinard.heuristic does not yield a result
Author: Lastpixl
Created: 2012-03-05 19:16:41+00:00
State: open

```
peinard.heuristic({"a": Decimal(-1.1), "b": Decimal(0.1), "c": Decimal(1.0)})
```
yields the following exception:
```
AssertionError: Lends: [], debts: [['a', Decimal('-8.326672684697421729788184166E-17')]]
```
even though there is a solution ("a" gives 1 to "c", "a" gives 0.1 to "c").
Decimal numbers seem to be incorrectly used.