Auto refresh toggle added to disable auto update.
Small issues with task model and data processing.
Adding stats spefific tokens to tasks header. They come from updating database entry with  qacct.
update_from_database needs rewrite. For now adding commends and deleting all previous scaled sublist.
New icons added.
changed name from isNun to to_number. Also it always returns a number (0.0 on fails with convertion).
changed float to int in cputime hook.
New delagate for TasksView, with optionall colorizing of tasks. Combo to select this settings, and callback to contro it also added.
Changed default image viewer.