[IMP] energy_selfconsumption: contract generation improvment
Changelog
- [IMP] energy_selfconsumption: wizard view showing warning text
- [IMP] energy_selfconsumption: added start_date to generation wizard and used to create contracts with the selected date
- [IMP] energy_selfconsumption: constraint on start_date so can select a date inferior of three months before today (90 days).