Completed task completion for both assignor and assignee.

The assignee can apply for completion, after that, the assignor may or
may not accept that. He can either revert it ongoing or mark the task as completed.

[issue] On the display table view the status can be changed. This needs to be fixed.
Changed the name of the result displaying file from form and noform to
assignee and assignor respectively.
Fixed display table issue. Now, the display table file will show the table
of tasks without any form. And it can be seen by any user.
Changed word "ongoing" to "all" in the gui.html file.