PicasaWeb Uploader patch

[Richard Schwarting <aquarichy gmail com>]

Hello.

I use PicasaWeb and EoG.  I once wrote an awful little EoG plugin  to
run a medieval command-line client to upload to it.  With the advent
of Philip Withnall's libgdata, I decided to be enlightened and try
writing a Proper plugin, making use of libgdata's PicasaWeb support
(disclaimer: I'm the PicasaWeb support's principal author).   Behold,
a fancier PicasaWeb uploading plugin:

    https://bugzilla.gnome.org/show_bug.cgi?id=600190 (patch attached)

I based it off of Postr, but it has a bit more GUI, including a
configuration dialogue for logging in and a pop-up when uploading is
complete or errors are encountered.  (Pop-up may not be desirable.)

I welcome all recommendations and comments, and wonder whether it
could be included into the eog-plugins 2.29.x series by any chance,
once the patch is satisfactory.

Cheers,
  Richard Schwarting