behaviour of the modulo operator

# Feature or enhancement

### Proposal:

The behaviour of the modulo operator should be made consistent across Python and C/C++.
```python
3%2 # this is 1
-3%2 # this can be represented as -1 or 1 depending of the divisor.
# -3%2 is -1 in C/C++.
```


### Has this already been discussed elsewhere?

I don't think so.
