+ New sorting for back-end variables.

 - subscripts are compared only if the crefs match without considering subs. i.e. pushed to the end of the cref.
+ Fixed state-sets generation and initialization to use the correct indexing. 
 - Used to be transposed.

git-svn-id: https://openmodelica.org/svn/OpenModelica/trunk@20908 f25d12d1-65f4-0310-ae8a-bbce733d8d8e

Author: mahge