[FR] -days

Sorry for the short presentation, got to do a lot of other stuff and make the stupid OpenVPN virtual machine working.

Due to **a lot** of controversy with days and whatnot these last times, why not add a `-days` parameter to everything (checking that the `NotAfter` of a certificate isn't due **after** the `NotAfter` of the CA) and allow the user to customize literally **everything** about the time constrains? (on a local (maybe offline) dev machine a user might even want to issue a wildcard cert maybe every 10y or so)

(also) Why there are no `-orgunit` or `-country` and such for "personalizing" the certificate? I know it matters the least, but my OCD claims for perfectly-organized digital management 😅