- all "type" keyword arguments, such as those to bindparam(), column(),

- all "type" keyword arguments, such as those to bindparam(), column(),
  Column(), and func.<something>(), renamed to "type_".  those objects
  still name their "type" attribute as "type".
- new SQL operator implementation which removes all hardcoded operators
  from expression structures and moves them into compilation;
  allows greater flexibility of operator compilation; for example, "+"
  compiles to "||" when used in a string context, or "concat(a,b)" on
  MySQL; whereas in a numeric context it compiles to "+".  fixes [ticket:475].
- major cruft cleanup in ANSICompiler regarding its processing of update/insert
  bind parameters.  code is actually readable !
- a clause element embedded in an UPDATE, i.e. for a correlated update, uses
  standard "grouping" rules now to place parenthesis.  Doesn't change much, except
  if you embed a text() clause in there, it will not be automatically parenthesized
  (place parens in the text() manually).