Reorganise more files into subdirectories and add CPAN support via Module::Build

MANIFEST

@@ -0,0 +1,46 @@
+aclocal.m4
+AUTHORS
+automake/install-sh
+automake/mdate-sh
+automake/missing
+automake/stamp-vti
+bin/chkstow
+bin/chkstow.in
+bin/stow
+bin/stow.in
+Build.PL
+ChangeLog
+configure
+configure.ac
+COPYING
+doc/stow.8
+doc/stow.info
+doc/stow.texi
+doc/texinfo.tex
+doc/version.texi
+INSTALL
+lib/Stow.pm
+lib/Stow.pm.in
+lib/Stow/Util.pm
+Makefile.am
+Makefile.in
+MANIFEST			This list of files
+NEWS
+README
+t/chkstow.t
+t/cleanup_invalid_links.t
+t/defer.t
+t/examples.t
+t/find_stowed_path.t
+t/foldable.t
+t/join_paths.t
+t/parent.t
+t/stow.t
+t/stow_contents.t
+t/testutil.pm
+t/unstow_contents.t
+t/unstow_contents_orig.t
+THANKS
+TODO
+META.yml
+META.json