DRT-40
- updated AuthorsProcessing.cs;
- added new issues to in progress, open and unassigned, containing subtasks for each section;
- added StatusType and AssigneeSubtasks to Issue
- implemented SetStatusType method in IssueAdapter.cs;
- deleted UncompletedTasks.cs;
- implemented GetParentTasks and CreateParent methods to TasksService.cs
- updated email template;
- removed inProgress, openTasks and unassignedTasks partial views and replaced them with uncompletedTask.cshtml;