GUI Improved: Add the function to move task downloded files to corresponding folder when change task catalog
GUI Improved: Improve task list diaply speed
GUI Bugfix: fix the bug that the publisher's webpage may be openned incorrectly when selecting multi-task using mouse
GUI Bugfix: fix the bug in version 0.71 that the UPNP gateway NAT port mapping function does not work
GUI Bugfix: fix the bug in version 0.71 that the task download rate in balloon tip is not diaplayed correctly when main window is minimized
GUI Bugfix: fix the bug in version 0.71 that the balloon tip will not diaplay when task download finish and main window is minimized
GUI Bugfix: fix the bug in version 0.71 that stop task while playing video may cause program crash
