Equivalent to the Excel fill handle
#### Code Sample, a copy-pastable example if possible

```python
df.col_name.fill_down(val, start_row = 0, end_row= end)
df.loc[row_idx].fill_right(val, start_col = 0, end_col = last)
```
#### Problem description
It would be nice if there were an analog for the excel fill handle.  I am not an experienced programmer and I don't want to imply that I think the functionality should be implemented the way I suggest above, but it would be nice to have for those coming from excel to pandas.  If the val were a list, maybe it could fill repeats of the list like the fill series works in excel.
#### Expected Output
Filled values from the desired start column/row to the end or otherwise declared column/row

