can now create upstream to downstream direct connections
unrelevant list elements are grayed-out

grey out Calculate button if basins structure is invalid
use Mermaid Nodes for walls
suffix multiple walls on same basins pair
base Mermaid Nodes on children UIDs
display Mermaid code (debug)
unselect element after deletion
highlight selected element

add basin
remove basin (buggy)
remove wall

update protractor method for mat-select

add warning about criteria that are subject to changes
update attribution

add option "messageWhenEmpty" in SelectField

Resolve "Ajout de la fonctionnalité "Respect des critères""

See merge request !82

Merge branch '223-ameliorer-le-systeme-de-traduction' into '60-ajout-de-la-fonctionnalite-respect-des-criteres'

Resolve "Améliorer le système de traduction"

See merge request !105