A bug was introduced in 440a0e460b, erroneously
changing the name of the baseline for a comparison.
The bug was left unnoticed with recent versions of MATLAB and on Octave,
because the first array in the ensuing comparison had zero line, and because of
automatic broadcasting, the error message was not triggered.
However, the bug was exposed on MATLAB < R2016b.
Several tests need to be adapted, because they were implicitly making the
assumption that there is no auxiliary variable.
Incidentally, this closes#1731. This commit therefore also removes the
workaround introduced in 0391dbbeb1.
and lags on more than one period: All variables different from zero
must be declared in histval. The reference simulation has one lag
because of k(-1).