Correct Node repr.
Update flake8 config
Remove H* errors
Add support for rolling years and months.
Add comment for NaN detection.
Add comment.
Correct split of date strings.
Correct anystring_to_strict_int converter (validated with doctest).
In periods, rename "step" to "instant". Improve periods and instants converters.
Accept simplified notation like "2014", "2014-2" or "2014-1:2014-12" when converting JSON to a period.
Rename PeriodMixin.date (resp. date_str) to PeriodMixin.period_date (resp. period_date_str).
Improve conversion of periods.
Factorize method of scenarios that sets the axes of the simulation.
Factorize method of scenarios that sets the variables of a simulation.
Add support for multiple periods in JSON of input variables and axes.
Factorize conversion of JSON or Python to axes.
Add support for multiple periods in JSON of input variables.