Able to limit the rows returned after other filters

[qc00]

Currently, the row_range/head/tail() filter is applied before any other filter and conflicts with the date_range filter. Most other databases support a top(n) or rownum < n feature and there's user demand.

We have to be careful to avoid confusion with the existing row_range/head/tail().

Ideally, we add this to the evolved query builder API so the ordering is clear.