viewer: the rest of the hover line bits for chart

tests: two more checks for index page

models: "finished" was dropped from order by, so this index is not used Index page still uses "finished" in order by, but it needs a different index.

models: it's now obvious that the order of columns should be this Now the index helps with "where project_id = ?" and "order by ordinal" as well.

viewer: use order_by() explicitly, helps with keeping indices up-to-date

viewer: basic line chart for checks (errors, warnings, duration)

viewer: use two columns for info lists on check page for small screens too Since lists themselves switch to one column on small screens, there's enough space for both of them side by side.

viewer: get reference check in a separate method

viewer: create an index for checks to speed up "order by" a lot

viewer: missing dot.svg template