FilterSet in ajax mode broke selection without typing
Prepare refactoring #2769
Group tasks together when importing test data to fail earlier #2769
Apply complementary logic on questionnaires #2769

We already used complementary computing for trend lines, but did not
do it on questionnaires. This lead to confusing chart with points
(questionnaires) with a very different value than trend lines.

The difference was, in part, when a ratio was applied to "Total improved",
then the ratio was not taken into account to compute "Other improved",
which was wrong. By using complementary computing, we automatically
benefit from all ratios or special cases done for "Total improved".
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Chart title did not update when changing country or part #2769
Test user was not granted Survey Editor