Fix minor bugs

Fix cp behaviour to match POSIX spec

Fix ls for dotfiles as arguments

Fix std_getopt misuse

Replace empty getopt with noopt

Add sleep

Refactor tail

Fix cp chmod for symlinks

Match tertium API

Match tertium API

Replace serr with %r

Fix recursion behaviour

* Ignore hidden directories when '-Aa' is not given
* Always print ("%s:", dirname) when '-R' is given

Make minor changes

Fix invalid memory access

Ignore printlink type error

Fix target search

Fix ls sort

Fix cp dest path

Create tmp files in the same device

Match tertium API

Add whoami manpage