refs #501

refs #536

refs #535

refs #516

test(e2e): check computed parameter initial value is not null with "empty fields on calculator creation" option

refs #516

fix: graph crash in backwater curves calculator when embankment has a high value and calculation does not converge

refs #532

refs #516

refs #516

refs #516

fix: empty field 'number of falls" of 'generate fish ladder' dialog when 'enable empty fields on new calculator' option is set

refs #516

refs #503

refs #503

refs #480

refs #507

In parallel structures, when:
- set a structure parameter to variated mode
- cancel dialog
- copy structure
a dialog opens.
Now use object representation instead of clone to backup parameter before opening the variable mode dialog.

refs #508

refs #480

refs #508

when:
- "create calculators with empty fields" is set,
- a single value parameter is given a value,
- parameter mode changed to variable,
fields opening edition dialog are incorrectly filled.

refs #480

refs #508

refs #480

refs #508

refs #480

- fix enabled "switch to graph" button when form is invalid
- fix modification of the original parameter (now only modified when form is closed with "validate" button)

Fix #507

- migrate empty parameter check to FormPrebarrage

Refs #484

- known issue: The color changes only on item selection

Refs #484

Refs #431

ref #431

Refs #469

- remove unselection of the child on schema refresh
- add unselection on remove child action to focus on the parent when a child is removed

Refs #469

Refs #489

- And remove Froude, max and average velocities for submerged flow

Refs jalhyd#285