- deleted redundant functions in Tearing.mo

- renamed Cellier-tearing from "tearingSystem1_1" to "CellierTearing"
- set default heuristic for Cellier tearing to MC3


git-svn-id: https://openmodelica.org/svn/OpenModelica/trunk@19958 f25d12d1-65f4-0310-ae8a-bbce733d8d8e

Author: ptaeuber