BitComet 0.76

- GUI Improved: add Scheduler setting page in perferences dialog to adjust bandwidth depending time
- GUI Improved: add max/min upload rate per task settings in BT task page of perferences dialog
- GUI Improved: add New HTTP/FTP download button in toolbar
- GUI Improved: the total task number and selected task number are displayed in status bar of main window
- GUI Bugfix: fix the bug that the BitComet main window is not actived sometimes when download url from IE
- GUI Bugfix: fix the bug that the function of avoid system entering suspend mode still works even when no task is running
- Core Improved: improve memory allocation strategy, avoid huge physical memory usage when program running for a long time
- Core Bugfix: fix the bug that in 0.75 sometimes the file is not downloaded entirely when task finish