Removed all extends from Modelica.Icons.ObsoleteModel, if this was not already present in MSL3.2.
Explanation:
Existing user models look odd with the ObsoleteModel icons when opening with MSL 3.2.1.
A user should not be forced to manually change the obsolete models (that are usually just moved to another place).
Instead, this should be performed automatically by a script in a future MSL version.

git-svn-id: https://svn.modelica.org/projects/Modelica/trunk@6738 7ce873d0-865f-4ce7-a662-4bb36ea78beb