Should HDFStore raise an Exception or a Warning when I remove a nonexistent object?
Here is a case where I where the HDFStore would complain:

```
In [60]: store
Out[60]: 
<class 'pandas.io.pytables.HDFStore'>
File path: water/expected2.h5
/spelling            series       (shape->[2])

In [61]: store.remove('spellllling')
```

Is there a reason to keep it silent?
