Add the electron NIEL damage weights

This adds the missing electron table to the RD50 damage weights in both the CSV and the ROOT file.

- FluenceWeightCalculator already applies an electron table to e+ and e-, but the shipped files had none, so electrons weighed zero.
- The 15 points (0.3 to 200 MeV) are the Summers et al. values from the RD50 compilation.
- rd50_niel.root gains the graph electronDW; the other three graphs are unchanged.

https://rd50.web.cern.ch/NIEL/

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: sawenzel

Detectors/gconfig/data/rd50_niel.csv

@@ -3202,3 +3202,18 @@
 211,8.985000e+03,3.800000e-01
 211,8.995000e+03,3.789000e-01
 211,9.005000e+03,3.789000e-01
+11,3.000000e-01,3.182091e-03
+11,5.000000e-01,7.997571e-03
+11,7.000000e-01,1.138895e-02
+11,1.000000e+00,1.542861e-02
+11,2.000000e+00,2.489020e-02
+11,3.000000e+00,3.125633e-02
+11,5.000000e+00,3.979317e-02
+11,7.000000e+00,4.557525e-02
+11,1.000000e+01,5.160069e-02
+11,2.000000e+01,6.240558e-02
+11,3.000000e+01,6.779830e-02
+11,5.000000e+01,7.344410e-02
+11,7.000000e+01,7.634487e-02
+11,1.000000e+02,7.870054e-02
+11,2.000000e+02,8.105620e-02