Tag ristretto 0.6.0

- Fix bug #8723 (Remove duplicate accelerators)
- Reset adjustment-limits when closing the image (hide scrollbars)
- Show error-message when deleting an image fails.
- Show a 'Loading...' message in the statusbar when loading an image or
  directory-contents.
- Reload image when it is changed on the filesystem.
- Add a new accelerator to force a reload (ctrl-r) - (requires the removal
  of ~/.config/ristretto/accels.scm)
This tag has no release notes.