Changes for supporting postgresql 9.0: - Avoiding usage of SQL reserved keywords on plpsql functions (plpsql lexer and parser were reworked). - Fixing all those places on which FROM clause was automatically added by PG ( PG Config add_missing_from parameter was removed for this release of PG ). Many thanks to Tracy Adams and Jeff Lu for providing first version of the patches.
More code dealing with instance and global parameter semantics. I finally have a reasonable model of inheritance and semantics implemented, not perfect from a language-theoretic point of view, but works well without having to rewrite every bit of parameter-handling code in acs-core.