Added exfatlabel man page.

git-svn-id: http://exfat.googlecode.com/svn/trunk@204 60bc1c72-a15a-11de-b98f-4500b42dc123

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+.\" Copyright (C) 2011  Andrew Nayenko
+.\"
+.TH EXFATLABEL 8 "February 2011"
+.SH NAME
+.B exfatlabel
+\- get or set an exFAT file system label
+.SH SYNOPSIS
+.B exfatlabel
+.I device
+[
+.I label
+]
+
+.SH DESCRIPTION
+.B exfatlabel
+reads or changes an exFAT file system label (volume name).
+
+If
+.I label
+argument is present,
+.B exfatlabel
+sets the new volume name. Label can be up to 15 characters. This limit is
+shorter if characters beyond Unicode BMP are used because internally label
+is stored in UTF-16.
+
+If
+.I label
+argument is omitted,
+.B exfatlabel
+just prints current volume name.
+
+.SH EXIT CODES
+Zero is returned on success. Any other code means an error.
+
+.SH AUTHOR
+Andrew Nayenko
+
+.SH SEE ALSO
+.BR mkexfatfs (8)