Merge remote-tracking branch 'origin/feature/7660_replace_py_with_log_alg'
Re #7656. Add an 'expected' file for our BASIS data file.

This checks the number of events in the first event list (and the second,
just for fun) to avoid any regression of the fix for the bug described
in ticket #7524.
Merge branch 'feature/7656_speed_up_loadeventnexustest' into develop