After creating a new spreadsheet and using `addToFolder()` the My Drive label remains. Can we remove it? Couldn't retrieve a folder id for the My Drive root to use with `removeFromFolder()`. 

If not, I know we start from within a certain folder and use:

```
var folder = DocsList.getFolderById(id);
folder.createFile();

```

...but how do you do convert the file created to a spreadsheet?