added man page for basename

taken from pdcore.  actual implementation is mine.

diff --git a/utils/basename/basename.1 b/utils/basename/basename.1
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+.TH BASENAME 1 "2008-1.01" "pdcore utilities" "User Commands"
+.SH NAME
+basename \- return non-directory portion of a pathname
+.SH SYNOPSIS
+.B basename
+string [suffix]
+.SH DESCRIPTION
+Return the filename portion of a path/filename string, optionally stripping
+a suffix from the returned filename.
+.SH OPTIONS
+.TP
+None
+.SH OPERANDS
+.TP
+string
+Input pathname
+.TP
+suffix
+Suffix to strip from filename after path component removed.
+.SH "AUTHORITATIVE DOCUMENTATION"
+<http://www.opengroup.org/onlinepubs/9699919799/utilities/basename.html>
+.SH VERSION AND COMPLIANCE
+Utility version 1.01
+.P
+Functional compliance with POSIX:2008 (IEEE Std 1003.1-2008;
+Shell and Utilities, Base Specifications Issue 7).
+.SH UNLICENSE
+This is free and unencumbered software released into the public domain,
+provided "as is", without warranty of any kind, express or implied. See the
+file UNLICENSE and the website <http://unlicense.org> for further details.