版本历史：
- Added issue export functionality which allows users to export search results
- Added Add Event which allows users to customize their own events
- Support Email notification to issue watcher
- Added Aging Chart report which shows how many records have been in the selected states for how long
- Added Average Time report which shows the number of the records and their average time stayed in the selected states during a time period
- Support When or When not rule to DateTime and Date fields
- Added modification on When or When not rule to fields
- Added Session timeout setting which allows users to configure how long is the working session
- Support attachment uploading in Linux, Mac OS
- Support size change of the left side panel
- Other minor bug fixes and tweaks
