- Rewrote part of BackendDAECreate.lower2 for the bootstrapping (whic…

…h does not optimize if the first statements of different equation-sections are identical)

  - lower2 needs more work done as it does too much listAppend
  - this small change reduced the memory consumption from 16GB to 500MB for large simulations using the bootstrapping implementation


git-svn-id: https://openmodelica.org/svn/OpenModelica/trunk@7586 f25d12d1-65f4-0310-ae8a-bbce733d8d8e