Move author-only tests to xt directory

so they aren't run on installation by users

xt/00_local_distribution.t

@@ -0,0 +1,14 @@
+#!/usr/bin/perl
+# 00_local_distribution.t - Private test to check distribution
+# $Id$
+
+use strict;
+use warnings;
+use Test::More;
+
+eval { require Test::Distribution; };
+
+plan skip_all => 'Optional Test::Distribution not installed' if ($@);
+
+# Skip POD tests as we will test separately
+import Test::Distribution not => [ qw/pod podcover/ ];