updated implementation matrix

[Lofton Henderson <lofton@rockynet.com>]

All --

The implementation results matrix [1] is updated, to match the 4/19 updates 
of the Test Suite:

[1] http://docs.oasis-open.org/webcgm/test-materials/matrix.html

As you might recall, this was mostly a matter of removing (or modifying) a 
few tests that were related to 2.1 "at risk" features -- insufficiently 
implemented -- that got removed in (W3C) CR phase.

(I have also been cleaning up lots of stale information -- e.g., 2.1 
replacing 2.0 -- on the cgmopen.org site and the TC home page.)

Regards,
-Lofton.