Update to 1.16. Changes in this version:

• Increase width of size bar depending on terminal size (Christian Göttsche)
• Set/increment $NCDU_LEVEL variable when spawning a shell
• Indicate whether apparent size or disk usage is being displayed
• Display setuid, setgid and sticky bits in file flags in extended mode
• Fix error handling while reading --exclude-from file
• Improve JSON import to allow for several future extensions to the format
• Export link count in JSON dumps
• Don't export inode in JSON dumps for non-hardlinks