Update to 1.11.

Changes in 1.11:

• Added 'b' key to spawn shell in the current directory
• Support scanning (and refreshing) of empty directories
• Added --si flag for base 10 prefixes
• Fix toggle dirs before files

Changes in 1.10:

• Added 'c' key to display item counts
• Added 'C' key to order by item counts
• Added CACHEDIR.TAG support and --exclude-caches option
• Use locale-dependent thousand separator
• Use pkg-config to detect ncurses
• Clip file/dir sizes to 8 EiB minus one byte
• Fix buffer overflow when formatting huge file sizes

Changes in 1.9:

• Added option to dump scanned directory information to a file (-o)
• Added option to load scanned directory information from a file (-f)
• Added multiple scan and load interfaces (-0,-1,-2)
• Fit loading and error windows to the terminal width (#13)
• Fix symlink resolving bug (#18)
• Fix path display when scanning an empty directory (#15)
• Fix hang when terminal is resized to a too small size while loading
• Use top-level automake build
• Remove useless AUTHORS, INSTALL and NEWS files
• ncdu.1 now uses POD as source format

Changes in 1.8:

• Use hash table to speed up hard link detection
• Added read-only option (-r)
• Use KiB instead of kiB (#3399279)