CharlesC, JimB, HugoP,

The SEI WD plotting software was updated to the latest version today - r6273.

JimB added the nds2.py library to the python path, and SEI did a little troubleshooting, for it to work. It was tested and it appears fully functional here.

The plots produced by a click on "Plot trip", from the WD screen now feature:
- Drag plots (time series) to scroll along time
- WD state shown as background color
- Channel name display when clicking on a curve
- Current WD threshold display (+ and - limits)

This tool is to be used by the operators, and the commissioners, to figure out rapidely why an ISI tripped.

This update was approved in ECR-E1300774.

Work was performed under WP#4262, which is now closed.