Displaying partial scoring for problems with a checker

[sylwia-sapkowska]

Currently, for a problem with partial scoring, status on a test is OK independently from percent of score achieved on a particular test. This may cause confusion for new users. I propose adding percent of scores next to the output from the checker below the test status table, e.g.
Test 1a (30%): 1st line of output wrong, expected (...)

[MasloMaslane]

As I wrote in #584, I also suggest changing the status text, because not all people scroll down to the comments