Seafile pro 6.0.12 is ready. Fix two factor authentication and other bugs

This is a maintenance release with the following fixes:

  • Improve performance when checking group shared library permission
  • [fix] Fix image popup in favourite page
  • [fix] Fix generating sharing link with expiring time in file detailed view page
  • [fix] Don’t allow to create library with ‘/’ in name
  • [fix] Fix two-factor authentication
  • Add script to migrate between different storage backend