timeline view part 1
Merge branch 'master' into bug_774
bug #774 - presence start-end weekday timeline added
bug #774 - corrections
bug #774 - asserts deleted
group_by_weekday test added
test_group_by_weekday corrections
test_group_by_weekday and test_group_by_weekday_start_end corrections
test_group_by_weekday and test_group_by_weekday_start_end corrections part2
test_group_by_weekday and test_group_by_weekday_start_end corrections part3
Merge pull request #3 from aprzybyszewska/bug_774

Bug 774