Changed cql2pqf transformation to use a different evaluation order.

Changed cql2pqf transformation to use a different evaluation order.
The new order is: always, relation, structure, position, truncation,
index and relationModifier.
Old order was: always, relation, relationModifier, structure, index,
position, truncation. Note that the the latter ones override
former ones for identical attributes.. The new scheme means that
it is possible to override any existing attribute with a relationModifier.
And also that it is possible to override everything for the index
rule (except the ones listed in relationModifier). No order is perfect
but this one, we believe, covers more real cases.. The "always" should
have been called "default", since the attributes there can be overridden
with all the rest.