- Fixed lookup of builtin functions and variables in SCodeFlatten.

- Fixed lookup bugs in SCodeFlatten.
- Split SCode.traverseEEquationExps into traverseEEquations and
  traverseEEquationExps to be able to correctly handle for-equations in
  SCodeFlatten.
- Added traversal function Absyn.traverseExpBidir, that can traverse an
  Absyn.Exp both top-down and bottom-up.
- Added more builtin function to ModelicaBuiltin.mo.
- Fixed test case interactive/interactive_api_param so that it uses valid
  Modelica.


git-svn-id: https://openmodelica.org/svn/OpenModelica/trunk@7691 f25d12d1-65f4-0310-ae8a-bbce733d8d8e

Author: perost