- Improved the behavior of aliased() objects such that they more

- Improved the behavior of aliased() objects such that they more
accurately adapt the expressions generated, which helps
particularly with self-referential comparisons. [ticket:1171]

- Fixed bug involving primaryjoin/secondaryjoin conditions
constructed from class-bound attributes (as often occurs
when using declarative), which later would be inappropriately
aliased by Query, particularly with the various EXISTS
based comparators.