Possibility to reload tasks' graph/comparison table with only subset of the tasks

[lefterav]

The default view is the possibility to compare scores and see graph for all tasks loaded under an experiment set. In many cases researches may need to focus the comparison only between a subset of experiments (e.g. 3 or 4) and get the table and the graph only for them.

[ondrejklejch]

Done in 4aed52b1453ee16861a732d947bbb22c297fd38e.

Users can manually hide tasks. When they reload the page, all tasks will be shown.

[martinpopel]

Hiding works, but there is no other way to "unhide" a task than reloading the page. There could be a list of hidden tasks at the bottom of the page with "show" (or "include in graph") button. This is really low priority.