J. Kissel

Back in 2015, Leo updated the charge measurement scripts
    /ligo/svncommon/SusSVN/sus/trunk/QUAD/Common/Scripts/
    ESD_Night_ETMX.py
    ESD_Night_ETMY.py
to include automatic centering of the ETMs to the optical lever QPDs because he had found charge measurement results showed flaws if the optical lever was drastically miscentered (see LHO aLOG 19645). 

It's unclear why (it's pretty dense code, and I don't have the time to debug), but over the course of time, this auto-centering has become more problematic than it is useful: 
   - It makes an initial alignment adjustment to the alignment sliders (OPTICALIGN offsets) based on a measurement of the starting spot position.
   - the OPTICALIGN offsets have a finite ramping time (of order 2-10 seconds); before waiting for the ramp to finish or the optic to settle, it measures the spot position again, thinks its still miscentered, and makes another adjustment. 
   - This results in a semi-infinite loop of centering, and the charge measurements never start. 
Lately, even if I manually adjust the ETM alignment to be centered on the optical lever before I start the script, and hold the output of the OPTICALIGN banks such that the script *can't* have an influence on the centering, it *still* gets caught in the loop complaining that the optic is not yet aligned.

For the time being, I've commented out the use of the function OpLevAlign on line 616 (for both scripts). For reference, that function's definition starts on line 268 (for both scripts). I've commited the changes to the SUS repo.

I've also updated the charge measurement wiki page to reflect that one needs to be sure that (with the OPTIC's guardian in the ALIGNED state) the optic is centered on the optical lever before starting the measurements.