First go at fixing long group/user list. #9935

Conflicts:

	components/tools/OmeroWeb/omeroweb/webclient/templates/webclient/base/includes/group_user_dropdown.html
Group drop-down should stay the same for shorter group lists

Conflicts:

	components/tools/OmeroWeb/omeroweb/webclient/templates/webclient/base/includes/group_user_dropdown.html
Fix load_history template bug. See #10499
Merge pull request #1005 from will-moore/web-bugs-March7th_develop

Web bugs march7th develop