Added new directory common to enable sharing of some code and error

numbers between gpg, gpgsm and gpg-agent.  Move some files and code to
there.

common/Makefile.am

@@ -0,0 +1,35 @@
+# Makefile for common gnupg modules
+# Copyright (C) 2001 Free Software Foundation, Inc.
+#
+# This file is part of GnuPG.
+#
+# GnuPG is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+# 
+# GnuPG is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+
+## Process this file with automake to produce Makefile.in
+
+EXTRA_DIST = mkerrors
+#INCLUDES = 
+BUILT_SOURCES = errors.c
+
+noinst_LIBRARIES = libcommon.a
+
+libcommon_a_SOURCES = \
+	util.h i18n.h \
+	errors.c errors.h \
+	maperror.c 
+
+
+errors.c : errors.h mkerrors
+	$(srcdir)/mkerrors < $(srcdir)/errors.h > errors.c