Formalization of the work already started on the HQL_ANTLR_2 branch in SVN.

Specifically, split the translation into 4 phases instead of 3 phases (we really sorta, kinda have 4 phases already with the join-post-processor).

This is pre-requisite for many requested enhancements to HQL.

Also the idea is to consolidate code between HQL and Criteria translation, thus giving Criteria queries all the capabilities available in HQL.