New features

Added "All tools", "All areas" and "All tools & Areas" overview options in the calendar. Thanks @bpedersen2 for the contribution!
Added tool superusers who are allowed to train users on tools. They can be added in the detailed admin section, either in the user section or the tool section.
Added a way to restrict projects to only certain tools, regardless of the users qualifications. This can be done in Detailed Administration/Project.
A project restricted to certain tools will:
- allow reservations and usage of those tools only.
- allow reservations and login on area that this tool requires.
- allow staff charges on those tools and areas they require.
- allow training on those tools only.
Added a checkbox on projects to allow consumable withdrawals or not. Consumable withdrawals set through post usage questions are always allowed.
Added warning threshold and warning email addresses for Tool usage counter. Added corresponding email template in customizations
Added an area reservation ending reminder email 30 and 15 minutes before reservation ends and user is still logged in.

Improvements

Changed user's badge number field to string (rather than integer) to get around integer max number but also to provide better flexibility with card readers.
Added option to clear the list of consumable withdrawals.
Added tools the user is a backup owner on, in detailed administration user page.
Improved calendar support for making and cancellation reservations. Thanks @bpedersen2 for the suggestion.
Moved the set PI on project feature to Detailed Administration only.
Now sending task updated email when a task is cancelled.

Fixed issue where writing in a post usage question of type textarea would not update the "stop using tool" button
Fixed layout issues on pagination pages on mobile devices
Fixed an issue when multiple coincident reservations could be created at the same time.
Fixed NEMO install_systemd_service command.