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)

Solveurs are now listed as dependencies when closing a calculator
Solveurs are now listed as dependencies under the calculator name ("used by")
resetting a Solveur dependency's results triggers Solveur results reset

Resolve "Ajout de la loi Déversoir Noyé"

Closes #318

See merge request !68