Tag support

### Added Tag support!

- Right click on a node to see "Tag File" and "Tag Result" as new options
- The Tag menus have their own submenus which list
 - Bookmark File/Result
 - Create a new tag
 - All the current tags
- Bookmarking and selecting a tag does the same as bookmarking previously did
- Create a new tag opens a dialog with a name and comment option, also providing the list of already existing tags as examples, or "current directories" if you will
- Changed action names in all places called
- Added Tags node under Results and added it to the list of things to refresh