partly resolves #990: Adapted Electrical.Machines.Losses.InductionMachines.(Brush, StrayLoad, PermanentMagnetLosses) to be used with m>3 phases (strictly backwards compatible)

git-svn-id: https://svn.modelica.org/projects/Modelica/trunk@6078 7ce873d0-865f-4ce7-a662-4bb36ea78beb