- remove unused functions from IndexReduction.mo

  - function getDeterminants
  - function getDeterminants1
  - function getDeterminantDigraphSelect
  - function solveOtherEquations
  - function solveOtherEquations1
  - function traverseOrgEqnsExp
  - function hasDerivative
  - function processComps1
  - function compareOrgEqn
  - function processCompInv
  - function processComp
  - function getOrgEqn
  - function getOrgEqns
  - function getCompVars
  - function selectDummyDerivatives
  - function selectDummyDerivatives1
  - function selectDummyDerivatives2


git-svn-id: https://openmodelica.org/svn/OpenModelica/trunk@17846 f25d12d1-65f4-0310-ae8a-bbce733d8d8e

Author: lochel