put these on a separate line

and this seems to highlight a bug... wouldn't you say this makes more sense:

```python
files_to_copy = [
    (["src/seq2expr"], 'bin'),
    "README.txt",
    "data",
]
```

I.e., the files should be copied relative to `self.builddir` rather than `self.cfg['start_dir']` in the `MakeCp` easyblock?

I'm not sure if there's an easy way to fix this without breaking existing easyconfigs though...