MFC r313867,r313869,r313870,r314001:

r313867:
Add history and Authors section in the manpage
r313869:
Also add vsevolod@ in the authors
r313870:
Use full name for the month
r314001:
Make it more clear that -k sends SIGKILL, not the -s signal.

MFC: r289878

timeout(1): fix the acceptable range values for parse_signal()

Before both 0 and sys_nsig would be successfully returned by parse_signal()
although being invalid signal numbers.

Submitted by: Alexandre Perrin <alex@kaworu.ch>

MFC: r268745,r268746,r268747,r268748,r268749,r268861,r268750,r268751,r268763
r273769,r273771,r276771,r278810

New BSDL timeout(1) utility compatible with GNU timeout

Relnotes: yes

New BSDL timeout(1) utility compatible with GNU timeout

it fully passes the GNU timeout regression tests, it is written in a mostly
portable way (only signal parsing is relying on non portable structures)

Phabric: D377