Minor fix for README
We can't use eprintf etc. without using the arg.h macros.
Return proper error values in case execvp() fails
Don't complain if we use -f in ln(1)
Don't check remove() return value
Use sysconf() instead of HOST_NAME_MAX
Remove who(1) from sbase

It now lives in ubase.
Remove who(1) from README
Fix wrong length for sethostname()

This was messed up in the previous commit.
Simplify ln(1)
Add the -F flag to ls
Add Daniel Bainton to LICENSE
Preserve permissions when copying files
add the man entry for ls -F
Use the more portable NZERO instead of PRIO_*

We assume the valid range is [-NZERO, NZERO-1].
id(1) is not portable - move it to ubase
Update README

sbase compiles on minix3 as well.