Merge branch '312-remous-connecter-le-ressaut-sur-un-seul-point-lorsque-le-ressaut-est-court-une-seule-abscisse' into 'master'

Resolve "Remous: connecter le ressaut sur un seul point lorsque le ressaut est court (une seule abscisse)"

Closes #312

See merge request !67

convert Remous main chart to scatter

alsos fixes SectionParametree drawing not rendered

Resolve "Solveur multi-modules"

Closes #301

See merge request !65

interface for Solveur module
draw Solveur relations in modules diagram view

track pages
track calculations
track sessions saving / loading