Màj jalhyd: utilisation de isNumeric() au lieu de NumericalString

...components/base-param-input/base-param-input.component.ts

src/app/components/generic-input/generic-input.component.ts

src/app/components/ngparam-input/ngparam-input.component.ts

src/app/components/param-values/ngparam-max.component.ts

src/app/components/param-values/ngparam-min.component.ts

src/app/components/param-values/ngparam-step.component.ts