- Query.statement, Query.subquery(), etc. now transfer

- Query.statement, Query.subquery(), etc. now transfer
the values of bind parameters, i.e. those specified
by query.params(), into the resulting SQL expression.
Previously the values would not be transferred
and bind parameters would come out as None.

- Subquery-eager-loading now works with Query objects
which include params(), as well as get() Queries.