[Precision] IIDM precision not aligned with dynawo precision

[rosiereflo]

During the iidm dump, state variables that are read from Pu dynamic variables are multiplied by 100 before being dump. This might create inaccuracies: if dynawo precision is too low (for example 1e-3) then only 1 number after the comma is meaningful when we dump state variable * 100. A solution would be to link state variables and dynamic variables such as there is no need to recompute anything during the dump