doc: python bindings howto
doc: python bindings howto

* moved single encrytion examples up to the first ones, pending merge
  and major cut.
* This is basically just to make future checks of revisions a little easier.

gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme