beta-electron-3.0.0-dev.10

1. Feat: add an option to show the short author string (et al.) in the table view.
2. Fix: a bug when dragging a table item to tags/folders.
3. Fix: quickpaste cannot export BibTex for the linked folder.
4. Fix: a bug in the database related to root tags/folders.
5. Fix: some UI bugs.