Message displayed when plotting gates

[bpollner]

When plotting gates using plotgates(), the following message is displayed:
"Coordinate system already present. Adding new coordinate system, which will replace the existing one."
This is caused by adding
ggcyto::ggcyto_par_set(limits="instrument")
to the plot object.
A possible solution to avoid this (harmless) message might be to extract the machine limits manually from a flow frame, then create the plot object with these limits already.
As time is a factor at the moment, I will leave this as it is for now.