[IMP] project: Allow multi levels on sub-tasks

Purpose
=======

Currently, it is only possible to have 1 level of sub-tasks per task.
The user may want several levels of granurality.

Specifications
==============

Allow having multi levels of sub-tasks
- Move the parent_id field out of the debug mode and display it above the
  Deadline field
- Remove the 'parent task' stat button
- Add the parent_id field to the project.task optional list view
- Display the sub-tasks stat button on sub-tasks
- The 'sub-tasks' stat button should only count/display tasks from the
  first level of sub-tasks
- The name of the sub-task should be
  parent task: sub task level 1: sub task level 2: sub task level 3...
- The sub-task should be created in the sub-task project set on the
  parent task's project
- The subtask_planned_hours and the subtask_effective_hours fields should
  take into account the planned hours of all sub-level tasks

TaskID: 2107078

0 files changed, 0 insertions, 0 deletions