Error in the computation of the derivatives in Turn-Around Range ionospheric delay modifier
In "TurnAroundRangeIonosphericDelayModifier", method "modify", line
190.
The state derivatives are added twice due to the use of symbol "+="
instead of "=".
Thanks to Pascal Parraud for noticing the bug.
(from redmine: issue id 369, created on 2017-11-07, closed on 2017-11-25)