Improvements and fixes

The day power curve can now show expected production. A re-sent or withdrawn invitation now notifies the invited person.

• On a plant's production page, "Show Reference" draws expected production from the chosen sources onto the day power curve.
• Saving a change to thousands of strings at once no longer takes minutes and no longer looks as if it had failed.
• Removing an invitee who has not yet accepted now withdraws the invitation and notifies them, instead of being shown as removing a member.
• A re-sent invitation now reaches the invitee as a notification on their phone too, and its email says it is a reminder.
• An invitation or a password reset no longer arrives as two emails, only the one carrying the link.
• Third-party components received security updates.