Combine runs of print statements
Should we combine multiple print statements to save chars?

```lua
?"foo"
?"bar"
```

Becomes:
```lua
?"foo\nbar"
```

If we have more than 2 new lines `\n`, perhaps use `[[...]]` form if it's more efficient?

Only risk is where we have deliberately placed a command sequence that relies on being at the end of a print statement. Only one I can think of is when writing a stream of bytes, e.g. 
```lua
?"foo⁶!5600⁸⁸⁸"
?"bar⁶!5700⁶⁶⁶"
 -- must not concatenate.
```