Comment filtering

This PR enables the filtering of comments in csv log files

A comment could be :
```python
# Log of the odd behaviour that makes the robot kill himself
12673,673267,7382,787382
12673,673267,7382,787382
```
or
```python
12673,673267,7382,787382
     ## Another kind of comment.. ##
12673,673267,7382,787382
12673,673267,7382,787382
```

The following is not yet supported:
```python
12673,673267,7382,787382 #comment
```