Conversion of MS CSS 2.1 tests to reftests

Hey,

Attached is a diff to convert 830 tests to reftests (with a mere four 
references!). The list of tests for each reference is based upon tests 
that pass in Opera with the same screenshot, so anything that we fail 
won't be included, but still, 830 tests is a nice start.

It'd be nice if you could apply the diff (just adding five new files), 
and adding it to the build system, sometime in the near future.

All the best,

-- 
Geoffrey Sneddon — Opera Software
<http://gsnedders.com>
<http://opera.com>