With the features the readline library provides it would be too naive to ignore.
We break out of the curses mode into the prompt and get back in.
This change introduces dependency on libncurses.

Update README on dependencies

Calculation can take very long. Most Unix-ish OSes have utilities to do this.

It was troubling me. Mimicking 'gg' would have been hacky and would need
additional processing... 'g' was free. Who cares even if you press twice? ;)

Remove dependency on cut.

This commit adds dependencies on file, openssl and cut binaries.

We closely follow the output for stat(1).

1. Have a faster copy of strlcpy()
2. Remove redundant legacy files
3. Fix an issue with NULL check on array name

Numeric is numeric i.e., n, -n. +n.
Other forms such as --n, ++n, -c, +c should not be considered numeric.

If size is same (e.g. dirs), use alphanum sort.

If a filename has Unicode chars, the alignment is broken. Hence moving name to
the last column. This also makes the view compact.
Moving block and char dev indicators in the space for size.

Invoking nnn with:

nnn dir
nnn ./dir
nnn dir

wouldn't allow user to navigate to parent directory.