only write to currentValue during calculation
Fix incorrect use of isDefined in SectionCirc
isDefined: protection against empty result
.v is now held by ParamDefinition and not ParamValues
updated tests
adapted value mode checks to new local .v

Resolve "Ajout de Villemonte sur la loi de seuil triangulaire"

Closes #53

See merge request cassiopee/jalhyd!30

Refactor nubs

Closes #83

See merge request cassiopee/jalhyd!29

added related test

merged cParamsCanal and ParamsSection
Structures are now only defined by their LoiDebit (no more StructureType)
Session : fixed serialization of lately registered Nubs
Sections are now defined by a CalculatorType and a NodeType
fixed bug in findFirstSingleParameter
added tests for session serialisation

Merge branch '75-section-parametree-calculer-systematiquement-toutes-les-variables-meme-avec-un-parametre-qui-varie' into 'master'

Resolve "Section paramétrée: calculer systématiquement toutes les variables, même avec un paramètre qui varie"

Closes #75

See merge request cassiopee/jalhyd!26

Resolve "Ajout de la calculette : "Passe à bassins : Calcul du nombre de bassins""

Closes #26 and #16

See merge request cassiopee/jalhyd!25

Resolve "Améliorer le filtre de choix des paramètres pouvant être liés"

Closes #54, #69, #79, nghyd#185, nghyd#134, #67, #68, and #78

See merge request cassiopee/jalhyd!23