[foton] Poles and Zeros very near each other can sometimes cancel each other
Cancelling these nearby poles and zeroes can lead to a more stable filter.
See Jim's alog here:
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=70006
We could that make cancelling them an option, or at least add a warning. Our warning screen is getting full.
Edited by Erik von Reis