minor change

Continue preparing of #844: Use JS to highlight the current row in JD
tables so that the tables can be written by a build-script.
fix bug in vdot correction factor

* FIX: correction factor was always 1 due to a bug in 7460b94

Patch by Nils.
disable scroll zoom in maps

* FIX: scrolling over the training view caused zooming in the map

Patch by Nils.