- remove unused functions from IndexReduction.mo

  - function higerOrderDerivatives
  - function traversinghigerOrderDerivativesFinder
  - generateSelectEquationsMulti
  - setVarLstStartValue
  - generateSetExpressions
  - generateStartExpressions
  - generateStartExpressions1
  - incidenceMatrixfromEnhanced
  - incidenceMatrixElementfromEnhanced
  - incidenceMatrixElementElementfromEnhanced
  - incidenceMatrixfromEnhanced1
  - incidenceMatrixElementfromEnhanced1
  - incidenceMatrixElementElementfromEnhanced1
  - replaceAliasStateIncidence
  - getUsedStates
  - getEqnBlockMapper
  - getEqnBlockMapper1
  - getEqnBlockMapper2
  - generateSelectEquations
  - generateCondition
  - generateCondition1
  - generateCondition2
  - setStartValue
  - differentiateExp
  - traverseOrgEqnsExp
  - setSelectArray
  - unsetSelectArray
  - changeVarToStartValue
  - traverseOrgEqns
  - stateVar
  - transformJacToMatrix
  - removeZeroDetStates
  - removeZeroDetState
  - isStateIndex
  - stateSortFunc


git-svn-id: https://openmodelica.org/svn/OpenModelica/trunk@17848 f25d12d1-65f4-0310-ae8a-bbce733d8d8e