`SELECT *` should really render all the possible fields

[dnicolodi]

SELECT * currently does not render all fields but only a "resonable" subset. This is motivated by the fact that the postings table contains a large number of redundant fields. With more functions and accessor implemented, the redundant fields should be removed and SELECT * should be made to really return all fields.

This is a compatibility break and thus needs a deprecation warning before it can happen.