BitComet 0.74

- GUI Improved: add default settings of view size and list col width for common screen resolutions
- GUI Bugfix: fix the bug that in 0.73 an explorer window will be opened when task finish if the virus scan program path setting is incorrect
- GUI Bugfix: fix the bug that task list every 5 minutes auto-save function does not work
- GUI Bugfix: fix the bug that "Task File Move to" -> "Other Location" function only applied to first task when multi tasks are selected
- Core Bugfix: fix the bug that in 0.73 sometimes the file is not downloaded entirely when task finish