- added debug printing of model balancing activated with +d=checkModel

  added function Inst.checkModelBalancing similar to checkModel. If it
  doesn't work for MathCore we can comment it out.
- send the connection graph to functions (also return a new one):
  + Inst.changeOuterReferences (also faster implementation by sending in sources/targets)
    down to Inst.changeOuterReferences2/3/4
  + Inst.handleInnerOuterEquations 
  + Inst.instConditionalDeclaration
- updates due to Connect.INNER replaced by Connect.INSIDE
                 Connect.OUTER replaced by Connect.OUTSIDE
- for now disable the generation of equation from overconstrained connectors
- some comments added/updated.


git-svn-id: https://openmodelica.org/svn/OpenModelica/trunk@4749 f25d12d1-65f4-0310-ae8a-bbce733d8d8e