Set up open form login system

[mikkohei13]

Implement login to new open observation form, which is done in task #708

If logged in

• Save the obs into their account

If not logged in, and they give email that has an account on Laji.fi

• Make them login before submitting. Allow all normal functionality, e.g. resetting lost password.
  • Keep form data in browser memory (only one draft is enough.), so that data is not lost if user closes browser in the process.
• Also sllow submitting observation without logging in.
  • Inform user that observation won't go to their account if they don't login.

If not logged in, and their email doesn't have an account

• When user submits an observation, they don't need to register, but their contact information is stored
  • Offer user to create an account, without need to provide their information again.
    • Using the email they already gave.
    • User needs to provide a password.
  • Inform user that if they want to edit their observation, they need to register first
• If user registers later with the same email, their observations show up under their account
  • Nightly process will connects observations to accounts.
  • Inform user that observations will be visible the next day.

If not logged in, and user doesn't give email

• Observation is saved without username.
• User cannot edit the observation after submitting it.