alvarado: @FIX: The lti::fastEigensystem functor called the LAPACK function with a too short eigenvalues vector. This leads to an improper memory access that sooner or later was followed by a segmentation fault. Thanks to the wonderful VALGRIND tool, this was not so extremely difficult to find! Well, at least Valgrind said the wrong access was made within the LAPACK function. Difficult was to find which of the 20 arguments was wrong. Many documentation in the code was added to simplify this.