Add mandoc-manpage for mkfifo(1) and add full mode support

and mark it as finished in the README.

Previously, it would only parse octal mode strings. Given
we have the parsemode()-function in util.h anyway, why not
also use it?

mkfifo.1

@@ -1,19 +1,29 @@
-.TH MKFIFO 1 sbase\-VERSION
-.SH NAME
-mkfifo \- make named pipe
-.SH SYNOPSIS
-.B mkfifo
-.RB [ \-m
-.IR mode ]
-.I name ...
-.SH DESCRIPTION
-.B mkfifo
-creates named pipes (FIFOs) with the given names.
-.SH OPTIONS
-.TP
-.B \-m
-Set the file permission bits of newly created FIFOs to mode.  The mode
-is specified in octal as we do not currently support all the formats that
-the chmod(1) utility supports.
-.SH SEE ALSO
-.IR mkfifo (3)
+.Dd January 28, 2015
+.Dt MKFIFO 1 sbase\-VERSION
+.Sh NAME
+.Nm mkfifo
+.Nd create named pipes
+.Sh SYNOPSIS
+.Nm mkfifo
+.Op Fl m Ar mode
+.Ar name ...
+.Sh DESCRIPTION
+.Nm
+creates a named pipe for each
+.Ar name
+if it does not already exist.
+.Sh OPTIONS
+.Bl -tag -width Ds
+.It Fl m
+Set the file
+.Ar mode
+of newly created named pipes.
+.El
+.Sh SEE ALSO
+.Xr mkfifo 3
+.Sh STANDARDS
+The
+.Nm
+utility is compliant with the
+.St -p1003.1-2008
+specification.