Show resource days off in the GanttChart

[dbarashev]

We can show the names of resources assigned to tasks around task bars. It might be even more useful to show their days off when they overlap the assignments.

Possible issues and solutions: many resources can be assigned to the same task and all may have days off, even overlapping. It is not clear what to do in this case. One possible solution is to show days off under or above the task bar as thin colored rectangles:

1|2|3|
-------+
  task1|
-------+
=A  =B    
=====C

In the picture above resources A,B and C are assigned to task1 and = symbols show their days off.

Related issues: #18 #487 We can use days off bars as a way to suggest task rescheduling

[momarco]

I'm testing this very interesting software but I have a problem which my be related to this issue. Sometimes I need to assign a resource to a task for a limited time, not for all the task duration. So I would find very useful to:

1. add begin and end dates to any resource row in the "Resources" Tab of the task properties ( by default they could be the same as the task, so they wouldn't bother user that don't need this feature)
2. show resources as smaller sub-bars under the task and colour days off with the same rules of holydays.
3. the sub-bars could be hidden like indented tasks in the present version (- or + in a square )

It may be a little complicated to implement, but would add a lot of flexibilty and readability. When you have many people on a project, assigning some of them to a task just for a limited time it's probably a common practice.

What do you think ?