Add clear(1), eject(1) and halt(8) man pages

clear.1

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+.Dd October 16, 2013
+.Dt CLEAR 1 1
+.Os Linux
+.Sh NAME
+.Nm clear - clear the screen

eject.1

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+.Dd October 16, 2013
+.Dt EJECT 1 1
+.Os Linux
+.Sh NAME
+.Nm eject
+.Nd eject removable media
+.Sh SYNOPSIS
+.Nm eject
+.Op Fl t
+.Sh DESCRIPTION
+eject allows the CD-ROM tray to be opened or closed under software
+.br
+control.
+.Pp
+If no arguments are given, the CD-ROM tray is opened.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl t
+If supported, close the CD-ROM tray.
+.El

halt.1

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+.Dd October 17, 2013
+.Dt HALT 8 1
+.Os Linux
+.Sh NAME
+.Nm halt
+.Nd Halt, power-off or reboot the machine
+.Sh SYNOPSIS
+.Nm halt
+.Op Fl pr
+.Sh DESCRIPTION
+halt can be used to halt, power-off or reboot the machine.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl p
+power-off the machine.
+.It Fl r
+reboot the machine.
+.El