templates should never use ``/mgoblin_static/`` but use
``request.staticdirect()`` instead, which uses the proper paths
from the config.

This is relevant when running mediagoblin not on / but on a subpath
like /mediagoblin/.

I have fixed the current templates (git branch will be pushed
tomorrow).

The interesting question is, if the test suite should test for
this?
If so, here's an idea on how to do it:


1. in ``test_mgoblin_app.ini`` set ``direct_remote_path`` to
   something else than /mgoblib\_static/
2. While testing: add a special "middleware" to the main App, that
   greps the rendered html for mgoblin\_static and errors out.

That way all tested paths will at least also get tested for wrong
references. At least, that's my idea on this.

Resized versions of an image need to be in the same file format as
the original, or at least in a format which has the required
features (e.g. transparency).

The logos of Creative Commons recently uploaded by fajro to omgmg
have bad thumbnails, because the original images are in PNG format
with transparency, while the thumbnails are JPEG. The
black-on-transparent logo became black-on-black, and the
white-on-transparent logo became white-on-white.