Support show=image-1|image-2
New OmeroWeb/test for show=project-1|project-2
Fix flake8 errors
Fix flake8 errors
initially_select always == initially_open if first_object 'well'
Web test_show tests multiple wells

Selection of multiple wells is not currently supported
but we test that at least the first well is selected and
shown, while the second well is ignored.
Fix flake8 errors
Merge pull request #2973 from will-moore/rebased/dev_5_0/show_multiple_objects

show multiple objects (rebased onto dev_5_0)