Groups already work, but there's no visible way to create them on the website for non-admins.

1) Add a group list on the account profile page, with add & remove buttons

2) Clicking a group name there opens the group profile page

3) On the group page, it lists usernames & project belowing to group

4) Under the username, there's an "add username" short form that only the group founder see

5) next to each username, there's an (X) that only the group founder can see

6) put a link to the group profile next to the name of the group on each showcase page.