Paint.NET 2.61

- Fixed crash when clicking File->New when there is a malformed image in the clipboard
- Fixed several crashes related to pressing Ctrl+Z (Undo) or Ctrl+Y (Redo) before releasing the mouse button while still drawing
- Fixed Zoom Tool "haze" remaining after pressing Ctrl+Z before releasing the mouse button
- Fixed uninstaller not removing Start->Programs menu shortcut
- Fixed "Auto" button in Adjustments->Levels not updating one of its sliders
- Fixed a few small plugin API problems
- Fixed a race condition in the file loading code related to EXIF tags
- Added "Donate" to Help menu