Added a better error-message for using subscripts in modifiers

git-svn-id: https://openmodelica.org/svn/OpenModelica/trunk/doc@19132 f25d12d1-65f4-0310-ae8a-bbce733d8d8e

Author: sjoelund

bibliography/openmodelica.bib

@@ -2066,9 +2066,6 @@ @PROCEEDINGS{scsc1998
  year      = {1998}
  }
 
-<<<<<<< .mine
-
-=======
 @PROCEEDINGS{cpc2013,
  key       = {CPC'2013},
  editor    = {Alain Darte},
@@ -2078,5 +2075,3 @@ @PROCEEDINGS{cpc2013
  month     = jul,
  location  = {Lyon, France},
 }
-
->>>>>>> .r19130