when changing language, recalculating Nub that already had results was breaking chained results

separated chart related classes from RemousResultsComponent file

add e2e spec

MacrorugoCompound and PAB: fix bug in variable selector index when switching from variable mode to fixed mode

Resolve "Module y = a.x + b"

Closes #319 and #304

See merge request !69

VarResults: look for children variable names in parent config file (the only one that is loaded at this time)