Analyse: getExternalSystems() restored and completely renewed to an
accurate and fast service.
The external systems are visible in AnalysedOverview and Graphics, but
there is a to great number of them to be useful, since every separate
external class is shown; more then 200 in case of HUSACCT2012-08-05
without C#. Next move is to include external systems as FamixLibraries
and to aggregate them.