#774 fixed (Modelica.Mechanics.MultiBody.Examples.Loops.Fourbar2 is overconstrained at initialisation):

Corrected the wrong code and also the missing initial conditions.
Added a test model in ModelicaTest.


git-svn-id: https://svn.modelica.org/projects/Modelica/trunk@5869 7ce873d0-865f-4ce7-a662-4bb36ea78beb