Added

• Tag type and collection
• Note.tags field
• ff agenda --tag=... to show only tasks with specific tags
• ff add --tag=... to add a task with tags
• ff edit --tag=... to add tags to a task
• ff edit --delete-tag=... to remove tags from a task
• Link type and collection
• Note.links field
• Load notes once for searching tasks and wikis
• (ff agenda | ff search) --without-tag=... to filter notes without specific tag
• Show data dir in any output

Removed

• Autocreation of .ff directory next to .git. Let user creates .ff