libutil: Allow suffix to be NULL in humanize_{number,unsigned}()

Allow to pass NULL to the suffix argument to these two functions. If
suffix is NULL, then take it as "" (i.e., empty suffix). This

libutil: Allow suffix to be NULL in humanize_{number,unsigned}()

Allow to pass NULL to the suffix argument to these two functions. If
suffix is NULL, then take it as "" (i.e., empty suffix). This case
happens in nvmmctl(8).

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libutil: Fix a minor NULL deref issue in humanize_number()

Modify buf after checking it's not NULL. Although it's certainly a
misuse to pass a NULL as buf but with len > 0, fix it FWIW.

libutil: Sort files in Makefile

libutil: Bring in snprintb() and snprintb_m() from NetBSD

At least, nvmmctl(8) requires snprintb().

Clean up markup of AF_INET* in a few manual pages.

Revert "Fix various mistakes (s/it were/it was/) in manual pages."

This reverts commit e4adeac153e9f588eff22befbf196d2fd3444bc3.

Fix various mistakes (s/it were/it was/) in manual pages.

libutil/setusercontext: Apply FreeBSD's b149798e50fac1113a7.

FBSD commit msg:

Fix a clang 3.5 warning about abs(3) being given an argument of type
quad_t in setusercontext(). While here, sanitize

libutil/setusercontext: Apply FreeBSD's b149798e50fac1113a7.

FBSD commit msg:

Fix a clang 3.5 warning about abs(3) being given an argument of type
quad_t in setusercontext(). While here, sanitize the clamping of the
priority value, and use the correct type for the return value of
login_getcapnum().

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sockaddr_snprintf.3: Use .Er for errno values.

libutil: Add sockaddr_snprintf() (taken from NetBSD).

The man page has been adjusted a bit since we don't support Apple Talk
protocol.