[commit] Cool new samples

[Vincent Hardy <vi...@eng.sun.com>]

Thanks to the work that Stephane has done, I have been able to do the
sample file I was dreaming of: thumbnails.svg. I takes some time to 
load, but it links in all the test cases in "samples/tests" and is 
a single file that we should all load before making any commit. This
is only temporary, as I will be working on a single test case that 
will be our focus to detect regressions.

I have also added a new test case, called dataProtocol.svg, which 
shows usage of the base64 protocol image data (i.e., embeded image
data).

V.