Schema 790

So this is another critique that is based on copied code, so I'm obviously barking up the wrong tree, but it's good not to repeat bad practices.

If is good practice to make every local variable `final` unless it is otherwise mutated, including method arguments.  

Additionally, if the method declaration can't fit on a single line it should be split up like this:

```
public void deleteColumn(
    final EntityId entityId,
    final String family,
    final String qualifier,
    final long upToTimestamp
) throws IOException {
```