*Just* *add*

Removing the old Just Add product
Adding the new Just Add product
Adding the Add by CSV

*Resend* *invitation*

Moving Resend Invitation to its own product:
Following the change to Resend Invitation, and calling administrators "administrators", rather than managers

*Invitations*

Sanitising the email address, closing Feature 4023 <https://redmine.iopen.net/issues/4023>
Fixing some whitespace issues with the template, and updating the introductory paragraph
A fix for Sign up, Add member, Add members in bulk, Invite members in bulk, and Subscribe

*Speeding* *up* *the* *redirector*

Using just the RDB to figure out a redirect
Updating the file-query to return the file-name and MIME-type

*Closing* *issues*

Handling SVG images, closing Bug 3662 <https://redmine.iopen.net/issues/3662> and Bug 3663 <https://redmine.iopen.net/issues/3663>
Adding a privacy message and associated popup to the email-posting information on the Group page, closing Feature 3914 <https://redmine.iopen.net/issues/3914>
Only dropping attachments on the floor if they lack a file name
An update to the CSS to fix a 404:

*General* *cleanup*

Switching from assert-statements to raising some errors.
Updating some metadata
Explicitly deferring the loading of the loader