Proposed hierarchy for po4a documents, taking the dpkg manpages as an
example implementation.


Split manpages
--------------

man/
  foo.1/
    po/
      foo.1.pot
      LL.po
    po4a/
      po4a.cfg
      LL.add
    foo.1

Merged manpages
---------------

man/
  po/
    man.pot
    LL.po
  po4a/
    po4a.cfg
    LL.add
  foo.1
  bar.1