Revert "* Bug #12174 fixed - The function "routh_t" gives incorrect output for all denominators that include gain value "k"."

This reverts commit cdcaa9f47f2bdd67d41ff7dc0ee6eec1f5a88f90

Change-Id: Ie3c357ae440153e1c267643c34f6552c71da1255
Only xclick can catch callback execution.

Change-Id: Ie5d56e1fe66482120d9b38ef005f40092aac4690
* Bug #11497 fixed - A lot of EDT violation was detected by the
                     ThreadCheckingRepaintManager tool.

Change-Id: I07895ab937e2aa3da6c2ecc00fe4e73e3391445e
* Bug #11980 fixed - csim returned an error message in some cases: "Submatrix
                     incorrectly defined".

Change-Id: I8ad5e8203dc58621fc9b3fb7dda8d6e88a1e6cc0
* Bug #11941 fixed - show_margins() failed in 'nyquist' mode if the system is
                     in state-space form.

Change-Id: I9a18c0fc17452e94e7ca55a66a271a4ae2393cf5