updated method mark_done to both mark and unmark a task
added mark_done link to list view
Merge branch 'C4_framework_task_bootstrap' of https://github.com/MGhanem/smartsoft-13 into C4_framework_task_bootstrap
Merge branch 'C4_framework_task_bootstrap' of https://github.com/MGhanem/smartsoft-13 into C4_framework_task_bootstrap