Add a new Python-based utility we wrote for the FreeBSD Greek

documentation project (and anyone else interested to use it).
In the translated files, we have added special `tags' some time
in the past, using the format:

    %SOURCE%    en_GR.ISO8859-1/articles/foo/file.sgml
    %SRCID%     1.5

to denote that this translation was based on revision 1.5 of the
file referenced in `%SOURCE%'.

The `checkupdate' utility makes parsing and checking of these
tags easier.  It expects to receive a list of files to check in
standard input, so it can be run by typing:

    find el_GR.ISO8859-7 | checkupdate

This should report in standard output something like:

: el_GR.ISO8859-7/articles/compiz-fusion/Makefile rev. 1.1
:     1.1        -> 1.1         en_US.ISO8859-1/articles/compiz-fusion/Makefile
:
: el_GR.ISO8859-7/articles/compiz-fusion/article.sgml rev. 1.1
:     1.3        -> 1.5         en_US.ISO8859-1/articles/compiz-fusion/article.sgml

We will keep extending the `checkupdate.py' script to add more
features, like a "patch preview" mode.  The version committed
here works well enough for now, and it already shows a lot of
files that we have to update in el_GR.ISO8859-7 :)

Inspired by:    pgj's shell based version of `checkupdate'

el_GR.ISO8859-7/share/tools/checkupdate/Makefile

@@ -0,0 +1,15 @@
+# $FreeBSD$
+
+SCRIPTS= checkupdate
+MAN= checkupdate.1
+
+CLEANFILES= ${SCRIPTS}
+
+BINDIR?= ${HOME}/bin
+
+.SUFFIXES:	.py
+
+.py:
+	cat ${.ALLSRC} > ${.TARGET}
+
+.include <bsd.prog.mk>

el_GR.ISO8859-7/share/tools/checkupdate/checkupdate.1

@@ -0,0 +1,120 @@
+.\" Copyright (c) 2007 Giorgos Keramidas <keramida@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd June 15, 2008
+.Dt CHECKUPDATE 1
+.Os
+.Sh NAME
+.Nm checkupdate
+.Nd "check a translation of the FreeBSD doc/ tree for source updates"
+.Sh SYNOPSIS
+.Nm
+.Op Fl anpqv
+.Op Fl R Ar workspace
+.Sh DESCRIPTION
+The
+.Nm
+utility checks a translation of the FreeBSD
+.Pa "doc/"