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kotlinlang

Hi,
Thank you for creating Exposed, I'm having a great time learning the library :slightly_smiling_face: I was just wondering if it would be a good idea to change the `adjustSlice` function from
```fun adjustSlice(body: ColumnSet.() -&gt; FieldSet): Query = apply { set = set.source.body() }```
to something like
```fun adjustSlice(body: ColumnSet.(FieldSet) -&gt; FieldSet): Query = apply { set = set.source.body(set) }```
That way you can get a hold of fields that are currently a part of the fieldset for the query and do things like adding additional fields (or even removing fields).
To me this was useful when I wanted to add a single extra field to the slice, depending on some condition. Currently I've created this extension function that I'm using, and it works quite well:
```fun Query.addToSlice(vararg columns: Expression&lt;*&gt;): Query {
    return adjustSlice {
        slice(this@addToSlice.set.fields + columns)
    }
}```


Sound reasonable enougth. I'll extend `adjustSlice` on the next minor release.